Fair Value (Unobservable Input Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest rate contracts [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, Beginning of Period	$ 47	$ 169	$ 119	$ 174
Other Comprehensive Income (Loss)	(13)	(6)	(47)	9
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	(10)	0	(10)
Settlements	(2)	(5)	(17)	(34)
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	0	0	1	0
Balance, End of Period	35	142	35	142
Interest rate contracts [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Interest rate contracts [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Interest rate contracts [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	5	(4)	(14)	4
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	3	(6)	(21)	3
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	5	(4)	(14)	4
Credit contracts [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, Beginning of Period	6	6	10	(1)
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	0	0
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	0	0	0	1
Balance, End of Period	7	10	7	10
Credit contracts [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Credit contracts [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Credit contracts [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	1	4	(3)	10
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	1	4	(3)	10
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	1	4	(3)	10
Equity Contract [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, Beginning of Period	(84)	(6)	(51)	43
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	(7)	0
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	0	0	0	0
Balance, End of Period	(92)	(31)	(92)	(31)
Equity Contract [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Equity Contract [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Equity Contract [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(10)	(25)	(34)	(74)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(8)	(25)	(34)	(74)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(10)	(25)	(34)	(74)
Net Embedded Derivatives [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, Beginning of Period	2,453	1,214	2,290	1,032
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(30)	(10)	(40)	(9)
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	0	0	0	0
Balance, End of Period	2,403	1,299	2,403	1,299
Net Embedded Derivatives [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Net Embedded Derivatives [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Net Embedded Derivatives [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(14)	97	172	283
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Net Income (Loss)	(20)	95	153	276
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(14)	97	172	283
U.S. corporate securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	1,169	1,522	1,434	1,432
Other Comprehensive Income (Loss)	(7)	73	(21)	70
Purchases	20	56	109	143
Sales	(56)	(45)	(192)	(98)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers Into Level 3	0	2	49	26
Transfers Out of Level 3	(47)	(38)	(302)	(6)
Balance, End of Period	1,081	1,572	1,081	1,572
U.S. corporate securities [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2	2	7	5
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	2	2	7	5
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	2	7	5
U.S. corporate securities [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	(3)	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
U.S. corporate securities [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Foreign corporate securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	813	698	868	580
Other Comprehensive Income (Loss)	12	19	(10)	39
Purchases	0	26	56	100
Sales	(29)	(26)	(83)	(41)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers Into Level 3	11	40	15	93
Transfers Out of Level 3	(42)	(8)	(77)	(14)
Balance, End of Period	762	735	762	735
Foreign corporate securities [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Foreign corporate securities [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(3)	(14)	(7)	(22)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(3)	(10)	(3)	(16)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	(3)	(10)	(3)	(16)
Foreign corporate securities [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
RMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	352	233	278	239
Other Comprehensive Income (Loss)	(2)	16	7	32
Purchases	81	27	141	27
Sales	(15)	(24)	(37)	(46)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers Into Level 3	0	1	8	4
Transfers Out of Level 3	(23)	0	(4)	0
Balance, End of Period	393	252	393	252
RMBS [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	1	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	1	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)	1	0	0	0
RMBS [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(1)	(1)	0	(4)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	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	0	0	(2)
RMBS [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
ABS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	423	289	343	220
Other Comprehensive Income (Loss)	(2)	4	(3)	5
Purchases	37	7	136	98
Sales	(34)	(3)	(41)	(12)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	(16)	(4)	(28)	(18)
Balance, End of Period	410	293	410	293
ABS [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	1	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	1	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	1	0
ABS [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2	0	2	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
ABS [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
State and political subdivision securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	6	25	25	23
Other Comprehensive Income (Loss)	0	0	0	2
Purchases	0	0	0	0
Sales	(1)	0	(1)	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	(19)	0
Balance, End of Period	5	25	5	25
State and political subdivision securities [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
State and political subdivision securities [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
State and political subdivision securities [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
CMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	66	158	125	147
Other Comprehensive Income (Loss)	0	(1)	2	5
Purchases	18	32	24	33
Sales	(7)	(37)	(60)	(52)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers Into Level 3	0	22	0	28
Transfers Out of Level 3	(11)	(15)	(26)	0
Balance, End of Period	66	159	66	159
CMBS [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	1	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
CMBS [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	(2)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
CMBS [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Foreign government debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	2	2	3	2
Other Comprehensive Income (Loss)	0	0	(1)	0
Purchases	0	0	0	0
Sales	(2)	0	(2)	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	0	2	0	2
Foreign government debt securities [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Foreign government debt securities [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Foreign government debt securities [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Non-redeemable preferred stock [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	81	91	93	76
Other Comprehensive Income (Loss)	2	1	9	16
Purchases	2	0	2	0
Sales	(8)	0	(31)	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	77	92	77	92
Non-redeemable preferred stock [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Non-redeemable preferred stock [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	4	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Non-redeemable preferred stock [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Common Stock [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	30	22	26	21
Other Comprehensive Income (Loss)	0	1	1	5
Purchases	0	0	3	0
Sales	(4)	(1)	(4)	(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	0
Balance, End of Period	28	23	28	23
Common Stock [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Common Stock [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	2	1	2	(2)
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	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	0	0	(3)
Common Stock [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Short-term investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	2	22	13	10
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	0	45	2	66
Sales	0	(1)	(13)	(10)
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	2	66	2	66
Short-term investments [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Short-term investments [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Short-term investments [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Separate account assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	140	149	141	130
Other Comprehensive Income (Loss)	0	0	0	0
Purchases	1	4	3	4
Sales	0	(3)	(3)	(4)
Issuances	0	0	0	0
Settlements	0	0	0	0
Transfers Into Level 3	0	0	0	0
Transfers Out of Level 3	0	(2)	0	(1)
Balance, End of Period	140	148	140	148
Separate account assets [Member] | Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Separate account assets [Member] | Net Investment Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	(1)	0	(1)	19
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Separate account assets [Member] | Net Derivative Gains (Losses) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net Income (Loss)	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	0	0	0	0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Changes in Unrealized Gains (Losses) Included in Net Income (Loss)	$ 0	$ 0	$ 0	$ 0