Fair Value (Unobservable Input Reconciliation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Securitization Entities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	$ 0	$ 0	$ 0
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	(1,000,000)	0	0
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	13,000,000	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	12,000,000	0	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	(28,000,000)	(44,000,000)	(116,000,000)
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	0	0	0
Issuances	0	0	0
Settlements	16,000,000	18,000,000	79,000,000
Transfers Into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	(13,000,000)	(28,000,000)	(44,000,000)
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(1,000,000)	(2,000,000)	(7,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(1,000,000)	(2,000,000)	(7,000,000)
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0
Interest rate contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	(1,000,000)	58,000,000	67,000,000
Other Comprehensive Income (Loss)	40,000,000	(44,000,000)	(1,000,000)
Purchases	0	0	0
Sales	0	0	0
Issuances	0	0	0
Settlements	(22,000,000)	(12,000,000)	(25,000,000)
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	17,000,000	(1,000,000)	58,000,000
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	(3,000,000)	17,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0
Foreign currency exchange rate contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	14,000,000	37,000,000	56,000,000
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	0	0	0
Issuances	0	0	0
Settlements	(1,000,000)	1,000,000	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	7,000,000	14,000,000	37,000,000
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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)	(6,000,000)	(24,000,000)	(19,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(6,000,000)	(24,000,000)	(19,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(6,000,000)	(24,000,000)	(19,000,000)
Credit contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	23,000,000	33,000,000	1,000,000
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	0	0	0
Issuances	(4,000,000)	(1,000,000)	(3,000,000)
Settlements	0	(1,000,000)	(3,000,000)
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	12,000,000	23,000,000	33,000,000
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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)	0	(5,000,000)	36,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(7,000,000)	(8,000,000)	38,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	(5,000,000)	36,000,000
Equity market contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	0	0	0
Other Comprehensive Income (Loss)	0	0	0
Purchases	111,000,000	0	0
Sales	0	0	0
Issuances	(155,000,000)	0	0
Settlements	0	0	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	(30,000,000)	0	0
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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)	14,000,000	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	14,000,000	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	14,000,000	0	0
Net Embedded Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at January 1,	48,000,000	(109,000,000)	(790,000,000)
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	0	0	0
Issuances	0	0	0
Settlements	29,000,000	55,000,000	52,000,000
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	(67,000,000)	48,000,000	(109,000,000)
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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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)	(115,000,000)	115,000,000	636,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(144,000,000)	102,000,000	629,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(115,000,000)	115,000,000	636,000,000
FVO general account securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	14,000,000	26,000,000	14,000,000
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	0	(23,000,000)	0
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	14,000,000	14,000,000	26,000,000
FVO general account securities | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	5,000,000	12,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	5,000,000	12,000,000
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	5,000,000	12,000,000
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	6,000,000	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Residential mortgage loans — FVO
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	338,000,000	0	0
Other Comprehensive Income (Loss)	0	0	0
Purchases	124,000,000	339,000,000	0
Sales	(120,000,000)	(2,000,000)	0
Issuances	0	0	0
Settlements	(54,000,000)	0	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Balance at December 31,	308,000,000	338,000,000	0
Residential mortgage loans — FVO | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	20,000,000	1,000,000	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	20,000,000	1,000,000	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)	20,000,000	1,000,000	0
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Long-term debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	(43,000,000)	0	0
Other Comprehensive Income (Loss)	0	0	0
Purchases	0	0	0
Sales	0	0	0
Issuances	(30,000,000)	(43,000,000)	0
Settlements	20,000,000	0	0
Transfers Into Level 3	0	0	0
Transfers out of Level 3	18,000,000	0	0
Balance at December 31,	(35,000,000)	(43,000,000)	0
Long-term debt | Net Investment Income
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0
Long-term debt | Net Investment Gains (Losses)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0
Long-term debt | Net Derivative Gains (Losses)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0
U.S. corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	5,269,000,000	5,460,000,000	4,919,000,000
Other Comprehensive Income (Loss)	274,000,000	(36,000,000)	173,000,000
Purchases	1,027,000,000	1,188,000,000	1,282,000,000
Sales	(925,000,000)	(862,000,000)	(848,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	87,000,000	717,000,000	559,000,000
Transfers out of Level 3	(792,000,000)	(1,163,000,000)	(630,000,000)
Balance at December 31,	4,937,000,000	5,269,000,000	5,460,000,000
U.S. corporate | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	3,000,000	2,000,000	7,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	1,000,000	4,000,000
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	1,000,000	4,000,000
U.S. corporate | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(6,000,000)	(37,000,000)	(2,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(6,000,000)	(40,000,000)	(3,000,000)
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)	(6,000,000)	(40,000,000)	(3,000,000)
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
U.S. Treasury and agency
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	62,000,000	71,000,000	25,000,000
Other Comprehensive Income (Loss)	0	(3,000,000)	0
Purchases	0	0	47,000,000
Sales	0	(6,000,000)	(1,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	(62,000,000)	0	0
Balance at December 31,	0	62,000,000	71,000,000
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Foreign corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	3,198,000,000	3,054,000,000	2,258,000,000
Other Comprehensive Income (Loss)	(56,000,000)	3,000,000	142,000,000
Purchases	736,000,000	842,000,000	1,213,000,000
Sales	(229,000,000)	(646,000,000)	(489,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	119,000,000	250,000,000	99,000,000
Transfers out of Level 3	(175,000,000)	(284,000,000)	(123,000,000)
Balance at December 31,	3,591,000,000	3,198,000,000	3,054,000,000
Foreign corporate | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2,000,000	1,000,000	6,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	2,000,000	0	5,000,000
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)	2,000,000	0	5,000,000
Foreign corporate | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(4,000,000)	(22,000,000)	(52,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	(13,000,000)
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	(13,000,000)
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	2,513,000,000	1,702,000,000	691,000,000
Other Comprehensive Income (Loss)	67,000,000	140,000,000	220,000,000
Purchases	1,528,000,000	1,001,000,000	892,000,000
Sales	(542,000,000)	(328,000,000)	(242,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	45,000,000	41,000,000	131,000,000
Transfers out of Level 3	(29,000,000)	(71,000,000)	(12,000,000)
Balance at December 31,	3,629,000,000	2,513,000,000	1,702,000,000
RMBS | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	42,000,000	30,000,000	27,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	43,000,000	35,000,000	27,000,000
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)	43,000,000	35,000,000	27,000,000
RMBS | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	5,000,000	(2,000,000)	(5,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(1,000,000)	(3,000,000)	(2,000,000)
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)	(1,000,000)	(3,000,000)	(2,000,000)
RMBS | Net Derivative Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	430,000,000	402,000,000	219,000,000
Other Comprehensive Income (Loss)	1,000,000	2,000,000	(3,000,000)
Purchases	183,000,000	221,000,000	268,000,000
Sales	(39,000,000)	(66,000,000)	(167,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	5,000,000	74,000,000	104,000,000
Transfers out of Level 3	(130,000,000)	(202,000,000)	(12,000,000)
Balance at December 31,	449,000,000	430,000,000	402,000,000
CMBS | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(1,000,000)	(1,000,000)	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(1,000,000)	(1,000,000)	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)	(1,000,000)	(1,000,000)	0
CMBS | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	(7,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
CMBS | Net Derivative Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	2,526,000,000	1,923,000,000	1,146,000,000
Other Comprehensive Income (Loss)	35,000,000	(27,000,000)	(3,000,000)
Purchases	1,029,000,000	1,133,000,000	953,000,000
Sales	(725,000,000)	(429,000,000)	(157,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	34,000,000	1,000,000	4,000,000
Transfers out of Level 3	(1,373,000,000)	(79,000,000)	(20,000,000)
Balance at December 31,	1,492,000,000	2,526,000,000	1,923,000,000
ABS | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	6,000,000	0	1,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	1,000,000	0	1,000,000
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)	1,000,000	0	1,000,000
ABS | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(40,000,000)	4,000,000	(1,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
ABS | Net Derivative Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	274,000,000	282,000,000	291,000,000
Other Comprehensive Income (Loss)	22,000,000	(45,000,000)	19,000,000
Purchases	0	69,000,000	2,000,000
Sales	(115,000,000)	(37,000,000)	(55,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	70,000,000	1,000,000	25,000,000
Transfers out of Level 3	0	(2,000,000)	0
Balance at December 31,	202,000,000	274,000,000	282,000,000
Foreign government | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	4,000,000	5,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	1,000,000	4,000,000	5,000,000
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)	1,000,000	4,000,000	5,000,000
Foreign government | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(49,000,000)	2,000,000	(5,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Common Stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	50,000,000	60,000,000	104,000,000
Other Comprehensive Income (Loss)	0	(5,000,000)	(7,000,000)
Purchases	19,000,000	5,000,000	10,000,000
Sales	(21,000,000)	(31,000,000)	(24,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	0	1,000,000	1,000,000
Transfers out of Level 3	0	0	(31,000,000)
Balance at December 31,	52,000,000	50,000,000	60,000,000
Common Stock | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Common Stock | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	4,000,000	20,000,000	7,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(2,000,000)	0	(4,000,000)
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)	(2,000,000)	0	(4,000,000)
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Non-redeemable preferred stock
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	278,000,000	281,000,000	293,000,000
Other Comprehensive Income (Loss)	2,000,000	84,000,000	16,000,000
Purchases	0	17,000,000	5,000,000
Sales	(38,000,000)	(74,000,000)	(32,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	(82,000,000)	0	0
Balance at December 31,	163,000,000	278,000,000	281,000,000
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Non-redeemable preferred stock | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	3,000,000	(30,000,000)	(1,000,000)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(3,000,000)	(17,000,000)	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)	(3,000,000)	(17,000,000)	0
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Actively traded securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	12,000,000	6,000,000	0
Other Comprehensive Income (Loss)	0	0	0
Purchases	5,000,000	9,000,000	6,000,000
Sales	(7,000,000)	0	0
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	0	0	0
Transfers out of Level 3	(5,000,000)	(3,000,000)	0
Balance at December 31,	5,000,000	12,000,000	6,000,000
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	175,000,000	252,000,000	134,000,000
Other Comprehensive Income (Loss)	0	19,000,000	(19,000,000)
Purchases	230,000,000	174,000,000	246,000,000
Sales	(156,000,000)	(247,000,000)	(106,000,000)
Issuances	0	0	0
Settlements	0	0	0
Transfers into Level 3	0	0	5,000,000
Transfers out of Level 3	(18,000,000)	0	(8,000,000)
Balance at December 31,	230,000,000	175,000,000	252,000,000
Short-term Investments | Net Investment Income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	1,000,000	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Short-term Investments | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(2,000,000)	(23,000,000)	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	1,000,000	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	1,000,000	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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Separate account assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1,	1,209,000,000	940,000,000	1,082,000,000
Other Comprehensive Income (Loss)	0	0	0
Purchases	527,000,000	185,000,000	171,000,000
Sales	(376,000,000)	(204,000,000)	(379,000,000)
Issuances	81,000,000	72,000,000	2,000,000
Settlements	(28,000,000)	0	(1,000,000)
Transfers into Level 3	144,000,000	236,000,000	24,000,000
Transfers out of Level 3	(44,000,000)	(62,000,000)	(43,000,000)
Balance at December 31,	1,615,000,000	1,209,000,000	940,000,000
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
Separate account assets | Net Investment Gains (Losses)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	102,000,000	42,000,000	84,000,000
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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
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
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	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