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Fair Value (Unobservable Input Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Long-term Debt [Member] | Consolidated Securitization Entities [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period $ (31) $ (81) $ (44) $ (116)
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 5 26 19 70
Transfers Into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance,End of Period (26) (48) (26) (48)
Long-term Debt [Member] | Consolidated Securitization Entities [Member] | Other Revenues [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Long-term Debt [Member] | Consolidated Securitization Entities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Long-term Debt [Member] | Consolidated Securitization Entities [Member] | Net Investment Income [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Long-term Debt [Member] | Consolidated Securitization Entities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 (7) 1 2
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 7 (1) (2)
Long-term Debt [Member] | Consolidated Securitization Entities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Long-term Debt [Member] | Consolidated Securitization Entities [Member] | Other Expenses [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period   (98)   (1,175)
Other Comprehensive Income (Loss)   0   0
Purchases   0   0
Sales   97   1,149
Issuances   0   0
Settlements   1   23
Transfers Into Level 3   0   0
Transfers out of Level 3   0   2
Balance,End of Period   0   0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member] | Other Revenues [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   (1)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member] | Net Investment Income [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Liability Related To Securitized Reverse Residential Mortgage Loans [Member] | Other Expenses [Member]
        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Interest rate contracts [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, Beginning of Period 98 228 177 300
Other Comprehensive Income (Loss) (11) (16) (83) 13
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (47) 12 (27) (45)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 1 0
Balance, End of Period 45 217 45 217
Interest rate contracts [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 (67)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Interest rate contracts [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Interest rate contracts [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Interest rate contracts [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Interest rate contracts [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 5 (4) (14) 2
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 5 (7) (23) 16
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 5 (4) (14) 2
Interest rate contracts [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign currency exchange rate contracts [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, Beginning of Period 6 40 37 44
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 1 (2) 2 (16)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (1) 0 0 0
Balance, End of Period 9 58 9 58
Foreign currency exchange rate contracts [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign currency exchange rate contracts [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign currency exchange rate contracts [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign currency exchange rate contracts [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign currency exchange rate contracts [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 6 19 (28) 10
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 3 20 (30) 30
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 6 19 (28) 10
Foreign currency exchange rate contracts [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Credit contracts [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, Beginning of Period 25 24 43 1
Other Comprehensive Income (Loss) (1) 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 (3)
Settlements 4 0 0 (3)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 1
Balance, End of Period 31 40 31 40
Credit contracts [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Credit contracts [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Credit contracts [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Credit contracts [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Credit contracts [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 3 16 (11) 43
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 3 16 (12) 44
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 3 16 (11) 43
Credit contracts [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Equity market contracts [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, Beginning of Period (171) 575 128 889
Other Comprehensive Income (Loss) 0 1 (1) (1)
Purchases 0 7 4 16
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 (82) (7) (131)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of Period (251) 325 (251) 325
Equity market contracts [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Equity market contracts [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 6 10 15 22
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 5 11 15 22
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 6 10 15 22
Equity market contracts [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Equity market contracts [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Equity market contracts [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (86) (195) (390) (474)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) (85) (187) (390) (470)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (86) (195) (390) (474)
Equity market contracts [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Net Embedded Derivatives [Member]
        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, Beginning of Period (678) (3,961) (3,162) (4,203)
Other Comprehensive Income (Loss) (16) (78) 193 (39)
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (217) (170) (583) (473)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, End of Period (53) (3,922) (53) (3,922)
Net Embedded Derivatives [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Net Embedded Derivatives [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (29) (3) (106) (7)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) (30) (4) (110) (9)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (29) (3) (106) (7)
Net Embedded Derivatives [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Net Embedded Derivatives [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Net Embedded Derivatives [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 882 283 3,589 781
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 888 291 3,609 802
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 882 283 3,589 781
Net Embedded Derivatives [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO general account securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 46 26 32 23
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 (2) (5) (2)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 0 14 0
Transfers Out of Level 3 0 0 0 0
Balance, End of Period 47 31 47 31
FVO general account securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO general account securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO general account securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 1 7 6 10
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 1 6 6 9
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 1 6 6 9
FVO general account securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO general account securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO general account securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO contractholder-directed unit-linked investments [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 593 1,096 937 1,386
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 308 903 348 918
Sales (232) (909) (430) (1,159)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 1 57 2
Transfers Out of Level 3 (20) (2) (294) (38)
Balance, End of Period 606 1,121 606 1,121
FVO contractholder-directed unit-linked investments [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO contractholder-directed unit-linked investments [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO contractholder-directed unit-linked investments [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (43) 32 (12) 12
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (1) 6 (5) 1
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (1) 6 (5) 1
FVO contractholder-directed unit-linked investments [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO contractholder-directed unit-linked investments [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
FVO contractholder-directed unit-linked investments [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. corporate securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 5,918 7,394 7,433 6,784
Other Comprehensive Income (Loss) (32) 323 (38) 351
Purchases 297 442 824 1,371
Sales (249) (348) (907) (865)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 117 128 324 266
Transfers Out of Level 3 (172) (239) (1,733) (222)
Balance, End of Period 5,886 7,699 5,886 7,699
U.S. corporate securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. corporate securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. corporate securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 3 5 10 10
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 2 3 9 8
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 2 3 9 8
U.S. corporate securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 4 (6) (27) 4
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 (3) (34) (6)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 (3) (34) (6)
U.S. corporate securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. corporate securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign corporate securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 6,008 4,813 6,208 4,370
Other Comprehensive Income (Loss) 71 135 (97) 233
Purchases 684 630 1,364 1,535
Sales (273) (276) (714) (708)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 173 172 254 254
Transfers Out of Level 3 (390) (156) (728) (322)
Balance, End of Period 6,264 5,310 6,264 5,310
Foreign corporate securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign corporate securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign corporate securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 5 5 11 16
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 5 5 10 18
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 5 5 10 18
Foreign corporate securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (14) (13) (34) (68)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (3) (10) (3) (27)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (3) (10) (3) (27)
Foreign corporate securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign corporate securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign government debt securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 1,971 2,386 1,814 2,322
Other Comprehensive Income (Loss) (42) 43 (104) 26
Purchases 209 370 551 1,003
Sales (61) (254) (105) (467)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 68 51 91 53
Transfers Out of Level 3 (78) (16) (195) (350)
Balance, End of Period 2,063 2,590 2,063 2,590
Foreign government debt securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign government debt securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign government debt securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (6) 4 3 4
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (6) 5 3 12
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (6) 5 3 12
Foreign government debt securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 2 6 8 (1)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign government debt securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Foreign government debt securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. Treasury and agency securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 82 74 71 31
Other Comprehensive Income (Loss) 0 0 (2) 0
Purchases 0 0 0 49
Sales (2) 0 (4) (6)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 (15) 0 0 0
Balance, End of Period 65 74 65 74
U.S. Treasury and agency securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. Treasury and agency securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. Treasury and agency securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. Treasury and agency securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. Treasury and agency securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
U.S. Treasury and agency securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
RMBS [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 2,735 2,363 2,037 1,602
Other Comprehensive Income (Loss) (16) 108 108 149
Purchases 563 249 1,155 1,060
Sales (138) (114) (242) (315)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 11 12 76
Transfers Out of Level 3 (136) (49) (76) (12)
Balance, End of Period 3,018 2,573 3,018 2,573
RMBS [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
RMBS [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
RMBS [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 9 8 20 20
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 9 8 26 20
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 9 8 26 20
RMBS [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 1 (3) 4 (7)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 (1) (3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 (1) (3)
RMBS [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
RMBS [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
CMBS [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 1,050 1,038 1,147 753
Other Comprehensive Income (Loss) 22 7 (28) 21
Purchases 305 416 549 695
Sales (71) (249) (339) (253)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 26 113 40
Transfers Out of Level 3 (133) (23) (266) (12)
Balance, End of Period 1,176 1,214 1,176 1,214
CMBS [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
CMBS [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
CMBS [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 4 0 2 7
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 4 0 2 2
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 4 0 2 2
CMBS [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (1) (1) (2) (37)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 (4)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 (4)
CMBS [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
CMBS [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
ABS [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 3,758 2,680 3,656 1,850
Other Comprehensive Income (Loss) (4) 32 (60) 19
Purchases 636 215 1,510 1,293
Sales (309) (47) (651) (286)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 2 0 6
Transfers Out of Level 3 (26) (36) (409) (48)
Balance, End of Period 4,063 2,850 4,063 2,850
ABS [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
ABS [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
ABS [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 3 4 12 14
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 3 4 10 14
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 3 4 10 14
ABS [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 5 0 5 2
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
ABS [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
ABS [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
State and political subdivision securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 41 76 54 53
Other Comprehensive Income (Loss) 0 1 (1) 4
Purchases 0 15 1 15
Sales (1) (6) (6) (7)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 (24) (21) (32) 0
Balance, End of Period 16 65 16 65
State and political subdivision securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
State and political subdivision securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
State and political subdivision securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
State and political subdivision securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
State and political subdivision securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
State and political subdivision securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Common Stock [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 183 282 190 281
Other Comprehensive Income (Loss) 6 (2) 0 7
Purchases 6 76 11 111
Sales (11) (102) (15) (126)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 1 0 1 3
Transfers Out of Level 3 (1) 0 (4) (13)
Balance, End of Period 185 262 185 262
Common Stock [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Common Stock [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Common Stock [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Common Stock [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 1 8 2 (1)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 (1) (1) (11)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 (1) (1) (11)
Common Stock [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Common Stock [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Non-redeemable preferred stock [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 408 432 419 438
Other Comprehensive Income (Loss) 11 4 77 23
Purchases 52 1 55 5
Sales (42) (60) (118) (89)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 48 0 48
Transfers Out of Level 3 (20) 0 0 0
Balance, End of Period 405 426 405 426
Non-redeemable preferred stock [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Non-redeemable preferred stock [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Non-redeemable preferred stock [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Non-redeemable preferred stock [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (4) 1 (28) 1
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 (17) 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 (17) 0
Non-redeemable preferred stock [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Non-redeemable preferred stock [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Actively traded securities [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 11 13 6 0
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 6 14 8 14
Sales (1) (11) 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 (5) (2) (3) 0
Balance, End of Period 11 14 11 14
Actively traded securities [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Actively traded securities [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Actively traded securities [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Actively traded securities [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Actively traded securities [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Actively traded securities [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Short-term investments [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 344 717 429 590
Other Comprehensive Income (Loss) 7 15 15 10
Purchases 106 515 189 1,059
Sales (266) (337) (414) (455)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers Into Level 3 0 186 0 0
Transfers Out of Level 3 0 0 (6) (108)
Balance, End of Period 192 1,097 192 1,097
Short-term investments [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Short-term investments [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Short-term investments [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 3 1 3 1
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 2 0 2 (1)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 2 0 2 (1)
Short-term investments [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (2) 0 (24) 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 (1) 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 (1) 0
Short-term investments [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Short-term investments [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Residential Mortgage Loans - FVO [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 150 0 0 0
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 67 0 214 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (3) 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 0
Balance, End of Period 212 0 212 0
Residential Mortgage Loans - FVO [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Residential Mortgage Loans - FVO [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Residential Mortgage Loans - FVO [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) (2) 0 (2) 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (2) 0 (2) 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) (2) 0 (2) 0
Residential Mortgage Loans - FVO [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Residential Mortgage Loans - FVO [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Residential Mortgage Loans - FVO [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Mortgage Loans Held-for-sale [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 0 211 49 1,414
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 1
Sales 0 (145) (45) (1,348)
Issuances 0 2 0 6
Settlements 0 (10) (4) (46)
Transfers Into Level 3 0 30 0 72
Transfers Out of Level 3 0 (1) 0 (4)
Balance, End of Period 0 64 0 64
Mortgage Loans Held-for-sale [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 (23) 0 (31)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 (22) 0 (25)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 (22) 0 (25)
Mortgage Loans Held-for-sale [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Mortgage Loans Held-for-sale [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Mortgage Loans Held-for-sale [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Mortgage Loans Held-for-sale [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Mortgage Loans Held-for-sale [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Separate account assets [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period 1,225 1,445 1,205 1,325
Other Comprehensive Income (Loss) 0 0 0 0
Purchases 106 144 249 294
Sales (84) (74) (223) (289)
Issuances 51 0 71 1
Settlements (2) 0 0 (3)
Transfers Into Level 3 162 2 161 25
Transfers Out of Level 3 (45) (128) (71) (41)
Balance, End of Period 1,417 1,407 1,417 1,407
Separate account assets [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Separate account assets [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Separate account assets [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Separate account assets [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 4 18 25 95
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Separate account assets [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Separate account assets [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss) 0 0 0 0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss) 0 0 0 0
Mortgage Servicing Rights [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, Beginning of Period   564   666
Other Comprehensive Income (Loss)   0   0
Purchases   0   0
Sales   0   0
Issuances   4   109
Settlements   (41)   (163)
Transfers Into Level 3   0   0
Transfers Out of Level 3   0   0
Balance, End of Period   490   490
Mortgage Servicing Rights [Member] | Other Revenues [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   (37)   (122)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   (24)   (88)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   (24)   (88)
Mortgage Servicing Rights [Member] | Policyholder Benefits and Claims [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Mortgage Servicing Rights [Member] | Net Investment Income [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Mortgage Servicing Rights [Member] | Net Investment Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Mortgage Servicing Rights [Member] | Net Derivative Gains (Losses) [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Mortgage Servicing Rights [Member] | Other Expenses [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net Income (Loss)   0   0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   0   0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)   $ 0   $ 0