Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Consolidated Securitization Entities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 10	$ 11	$ 12	$ 0
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	(1)	(1)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	12
Transfers out of Level 3	0	0	(1)	0
Balance, end of period	10	11	10	11
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(12)	(15)	(13)	(28)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	1	13
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	(12)	(15)	(12)	(15)
Consolidated Securitization Entities | Net investment income
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
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
Consolidated Securitization Entities | Net investment gains (losses)
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	(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)	0	0	0	(1)
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
Consolidated Securitization Entities | Net derivative gains (losses)
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
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
Consolidated Securitization Entities | Policyholder benefits and claims
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
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
Interest rate contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	69	56	63	13
Other Comprehensive Income (Loss)	(20)	11	(5)	49
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	(1)	0	(1)	0
Settlements	(22)	(40)	(31)	(41)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	18	36	18	36
Interest rate contracts | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	(1)	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(8)	9	(8)	15
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	(1)	0	0
Interest rate contracts | Policyholder benefits and claims
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(67)	(13)	(68)	(11)
Other Comprehensive Income (Loss)	(1)	1	1	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	7	3	19	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	(76)	(3)	(76)	(3)
Foreign currency exchange rate contracts | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(13)	4	(44)	7
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(15)	6	(28)	8
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(13)	4	(44)	7
Foreign currency exchange rate contracts | Policyholder benefits and claims
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	10	20	12	29
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	(1)	0	(3)
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	9	17	9	17
Credit contracts | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(2)	(1)	(3)	(7)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(1)	(2)	(3)	(9)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(2)	(1)	(3)	(7)
Credit contracts | Policyholder benefits and claims
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(357)	(356)	(307)	(317)
Other Comprehensive Income (Loss)	0	0	0	(1)
Purchases	4	4	4	4
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	8	0	9	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	(323)	(395)	(323)	(395)
Equity market contracts | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	22	(46)	(30)	(87)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	22	(45)	(30)	(87)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	22	(46)	(30)	(87)
Equity market contracts | Policyholder benefits and claims
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	2	1	6
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	2	1	6
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	2	1	6
Net Embedded Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	278	980	430	1,258
Other Comprehensive Income (Loss)	21	(18)	19	(24)
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(195)	(205)	(397)	(397)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	841	1,020	841	1,020
Net Embedded Derivatives | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	765	262	787	168
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	780	255	808	160
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	765	262	787	168
Net Embedded Derivatives | Policyholder benefits and claims
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(42)	8	(17)	24
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(43)	8	(19)	23
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(42)	8	(17)	24
FVO general account securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	89	29	95	29
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	1	0	1	0
Sales	(1)	0	(7)	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	69	0	69
Transfers out of Level 3	0	0	0	0
Balance, end of period	88	109	88	109
FVO general account securities | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(1)	11	(1)	11
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(1)	11	(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)	(1)	11	(1)	11
FVO general account securities | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	412	624	455	603
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	65	281	89	318
Sales	(121)	(270)	(196)	(368)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	52	37	53	27
Transfers out of Level 3	(42)	(107)	(12)	(21)
Balance, end of period	364	571	364	571
FVO contractholder-directed unit-linked investments | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(2)	6	(25)	12
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(5)	15	(18)	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)	(5)	15	(18)	14
FVO contractholder-directed unit-linked investments | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	329	352	308	338
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	45	24	104	51
Sales	(23)	(3)	(71)	(8)
Issuances	0	0	0	0
Settlements	(4)	(14)	(16)	(25)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance, end of period	345	367	345	367
Residential Mortgage Loans — FVO | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(2)	8	20	11
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(2)	8	20	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)	(2)	8	20	11
Residential Mortgage Loans — FVO | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Trading liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0	0	0
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	(4)	0	(4)	0
Sales	0	0	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	0	0	0	0
Balance, end of period	(4)	0	(4)	0
Trading liabilities | Net investment income
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
Trading liabilities | Net investment gains (losses)
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
Trading liabilities | Net derivative gains (losses)
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
Trading liabilities | Policyholder benefits and claims
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
U.S. corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	7,321	7,378	6,942	7,148
Other Comprehensive Income (Loss)	(297)	108	(235)	268
Purchases	336	487	686	863
Sales	(325)	(455)	(437)	(562)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	166	253	247	464
Transfers out of Level 3	(90)	(413)	(95)	(816)
Balance, end of period	7,133	7,369	7,133	7,369
U.S. corporate | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	5	4	8	4
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	4	2	6	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	2	6	2
U.S. corporate | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	17	7	17	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	(7)
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	(7)
U.S. corporate | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	6,408	6,501	6,490	6,704
Other Comprehensive Income (Loss)	(110)	339	(254)	298
Purchases	271	394	403	716
Sales	(213)	(323)	(261)	(240)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	86	223	117	517
Transfers out of Level 3	(63)	(518)	(126)	(1,386)
Balance, end of period	6,387	6,612	6,387	6,612
Foreign corporate | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	3	(1)	13	4
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	3	(2)	10	7
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	(2)	10	7
Foreign corporate | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	5	(3)	5	(1)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	(2)	0	(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)	0	(2)	0	(2)
Foreign corporate | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,384	1,545	1,311	2,235
Other Comprehensive Income (Loss)	(27)	(91)	(24)	(77)
Purchases	88	118	145	179
Sales	(20)	(96)	(31)	(109)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	10	284	209	312
Transfers out of Level 3	(103)	(184)	(281)	(962)
Balance, end of period	1,336	1,672	1,336	1,672
Foreign government | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	4	96	7	98
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	4	1	7	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)	4	1	7	3
Foreign government | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	(4)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	45	0	62
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	55	301	55	301
Sales	0	(26)	0	(1)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(42)
Balance, end of period	55	320	55	320
U.S. Treasury and agency | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	4,545	3,439	4,383	2,957
Other Comprehensive Income (Loss)	16	81	(4)	68
Purchases	453	802	863	1,176
Sales	(331)	(209)	(533)	(377)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	6	0	7	146
Transfers out of Level 3	(594)	(193)	(651)	(68)
Balance, end of period	4,136	3,945	4,136	3,945
RMBS | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	29	25	57	35
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	29	13	56	24
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)	29	13	56	24
RMBS | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	12	0	14	8
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(1)	0	(1)	(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)	0	(1)	(1)
RMBS | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	644	682	765	972
Other Comprehensive Income (Loss)	1	(8)	(7)	(32)
Purchases	84	15	85	61
Sales	(50)	(34)	(103)	(172)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	58	0	66	11
Transfers out of Level 3	(8)	(60)	(77)	(245)
Balance, end of period	729	595	729	595
CMBS | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2,453	2,800	2,244	4,210
Other Comprehensive Income (Loss)	(4)	(3)	(17)	63
Purchases	681	1,616	1,075	2,098
Sales	(67)	(259)	(247)	(567)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	89	121	104	548
Transfers out of Level 3	(1,001)	(492)	(999)	(2,533)
Balance, end of period	2,153	3,786	2,153	3,786
ABS | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2	1	(4)	5
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	2	0	(4)	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	(4)	0
ABS | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	2	(3)	(38)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2	21	0	10
Other Comprehensive Income (Loss)	0	0	0	1
Purchases	55	2	55	2
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	12	0	32
Transfers out of Level 3	(2)	0	0	(10)
Balance, end of period	55	35	55	35
State and political subdivision | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	94	203	95	177
Other Comprehensive Income (Loss)	0	40	4	43
Purchases	40	24	43	21
Sales	(5)	(2)	(8)	(14)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	27	2	26	40
Transfers out of Level 3	(1)	(79)	(3)	(79)
Balance, end of period	157	186	157	186
Common stock | Net investment income
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 | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2	(2)	0	(2)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	(2)	0	(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)	0	(2)	0	(2)
Common stock | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	244	441	250	395
Other Comprehensive Income (Loss)	(2)	15	(8)	14
Purchases	2	0	5	0
Sales	(15)	0	(15)	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	104	0	106	0
Transfers out of Level 3	(1)	(190)	(6)	(143)
Balance, end of period	332	263	332	263
Non-redeemable preferred stock | Net investment income
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 | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	(3)	0	(3)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	(3)	0	(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	(3)	0	(3)
Non-redeemable preferred stock | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	10	11	5	12
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	8	19	8	20
Sales	(4)	(2)	0	(5)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(1)	(8)	0	(7)
Balance, end of period	13	20	13	20
Actively Traded Securities | Net investment income
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 | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,358	1,032	336	254
Other Comprehensive Income (Loss)	(1)	0	(1)	(1)
Purchases	1,702	212	1,822	192
Sales	(975)	(461)	(60)	(76)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(277)	(538)	(290)	(124)
Balance, end of period	1,809	246	1,809	246
Short-term Investments | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2	1	2	1
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	1	1	1	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	1	1	1
Short-term Investments | Net investment gains (losses)
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2,056	1,730	1,922	1,465
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	153	131	310	348
Sales	(83)	(104)	(201)	(192)
Issuances	0	58	1	82
Settlements	(1)	(27)	(2)	(28)
Transfers into Level 3	0	4	0	2
Transfers out of Level 3	(170)	(122)	(110)	(51)
Balance, end of period	1,925	1,691	1,925	1,691
Separate account assets | Net investment income
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 | Net investment gains (losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(30)	21	5	65
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 | Net derivative gains (losses)
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 | Policyholder benefits and claims
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