Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Available-For-Sale [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	$ 2,264	$ 2,318	$ 2,092	$ 2,467
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(11)	1	(10)	11
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(21)	22	5	115
Purchases, Assets	379		1,154
Sales, Assets	(293)		(564)
Settlements, Assets	(85)		(365)
Purchases, Sales, Issuances and Settlements, Assets		(238)		(318)
Transfers into Level 3, Assets	14		54	30
Transfers out of Level 3, Assets	(227)	(74)	(346)	(276)
Balance, Ending, Assets	2,020	2,029	2,020	2,029
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(14)	(1)	(30)	(15)
Available-For-Sale [Member] | Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	36	4	26	11
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets		(3)	(2)	(4)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets			(1)
Purchases, Assets			19
Sales, Assets	(1)		(12)
Settlements, Assets
Purchases, Sales, Issuances and Settlements, Assets		15		14
Transfers into Level 3, Assets		6	5	8
Transfers out of Level 3, Assets	(3)		(3)	(7)
Balance, Ending, Assets	32	22	32	22
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30		(4)	(3)	(5)
Discontinued Operations Investments, Included In Other Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets				16
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets				1
Purchases, Sales, Issuances and Settlements, Assets				(2)
Transfers out of Level 3, Assets				(15)
Asset-Backed Securities [Member] | Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	1,273	1,060	1,199	1,100
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(4)		(8)	(5)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(18)	1	14	50
Purchases, Assets	263		692
Sales, Assets	(186)		(404)
Settlements, Assets	(38)		(134)
Purchases, Sales, Issuances and Settlements, Assets		(71)		(33)
Transfers into Level 3, Assets	2		2	7
Transfers out of Level 3, Assets	(73)	(20)	(142)	(149)
Balance, Ending, Assets	1,219	970	1,219	970
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(4)		(19)	(13)
Asset-Backed Securities [Member] | Fixed Maturities [Member] | Residential Mortgage-Backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	687	659	767	629
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	1	1	(11)	(7)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(5)	(9)	9	20
Purchases, Assets	73		170
Sales, Assets	(81)		(164)
Settlements, Assets	(13)		(54)
Purchases, Sales, Issuances and Settlements, Assets		(5)		50
Transfers into Level 3, Assets
Transfers out of Level 3, Assets	(31)		(86)	(46)
Balance, Ending, Assets	631	646	631	646
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30			(15)	(10)
Asset-Backed Securities [Member] | Fixed Maturities [Member] | Commercial Mortgage-Backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	95	95	73	123
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets			3	(1)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(7)	3	11	1
Purchases, Assets	76		81
Sales, Assets			(4)
Settlements, Assets
Purchases, Sales, Issuances and Settlements, Assets				6
Transfers into Level 3, Assets				7
Transfers out of Level 3, Assets	(5)	(20)	(5)	(58)
Balance, Ending, Assets	159	78	159	78
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30				(2)
Asset-Backed Securities [Member] | Fixed Maturities [Member] | Other Asset-Backed [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	491	306	359	348
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(5)	(1)		3
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(6)	7	(6)	29
Purchases, Assets	114		441
Sales, Assets	(105)		(236)
Settlements, Assets	(25)		(80)
Purchases, Sales, Issuances and Settlements, Assets		(66)		(89)
Transfers into Level 3, Assets	2		2
Transfers out of Level 3, Assets	(37)		(51)	(45)
Balance, Ending, Assets	429	246	429	246
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(4)		(4)	(1)
Asset-Backed Securities [Member] | Fixed Maturities [Member] | Redeemable Preferred Stock [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets			3
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets			3
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets			(3)
Sales, Assets			(3)
Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	2,378	2,509	2,276	2,664
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(14)	(1)	(11)	17
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(21)	22	5	115
Purchases, Assets	379		1,154
Sales, Assets	(293)		(636)
Settlements, Assets	(85)		(365)
Purchases, Sales, Issuances and Settlements, Assets		(239)		(333)
Transfers into Level 3, Assets	14		54	30
Transfers out of Level 3, Assets	(227)	(74)	(346)	(276)
Balance, Ending, Assets	2,131	2,217	2,131	2,217
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(17)	(3)	(24)	(10)
Fixed Maturities [Member] | Corporate And Other Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	812	718	624	609
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(7)	1	(5)	10
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets	(3)	18	(6)	56
Purchases, Assets	113		459
Sales, Assets	(107)		(157)
Settlements, Assets	(47)		(144)
Purchases, Sales, Issuances and Settlements, Assets		(83)		29
Transfers into Level 3, Assets	12		52	23
Transfers out of Level 3, Assets	(154)	(54)	(204)	(127)
Balance, Ending, Assets	619	600	619	600
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(10)	(1)	(11)	(2)
Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	179	539	266	756
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets		3		9
Purchases, Assets	3		3
Settlements, Assets			(87)
Purchases, Sales, Issuances and Settlements, Assets		(84)		(307)
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets	182	458	182	458
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30
Fixed Maturities [Member] | Redeemable Preferred Stock [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets		1		2
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets				6
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Sales, Issuances and Settlements, Assets				(7)
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets		1		1
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30
Fixed Maturities [Member] | Trading [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	114	191	184	197
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(3)	(2)	(1)	6
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Assets
Sales, Assets			(72)
Settlements, Assets
Purchases, Sales, Issuances and Settlements, Assets		(1)		(15)
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets	111	188	111	188
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(3)	(2)	6	5
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	52		32
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(4)		(11)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets			(1)
Purchases, Assets			20
Sales, Assets	(1)		(12)
Settlements, Assets
Transfers into Level 3, Assets			19
Transfers out of Level 3, Assets	(3)		(3)
Balance, Ending, Assets	44		44
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(4)		(12)
Equity Securities [Member] | Trading [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	16		6
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	(4)		(9)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Assets			1
Settlements, Assets
Transfers into Level 3, Assets			14
Transfers out of Level 3, Assets
Balance, Ending, Assets	12		12
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(4)		(9)
Life Settlement Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	129	134	129	130
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets	11	8	20	25
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Assets
Settlements, Assets	(15)		(24)
Purchases, Sales, Issuances and Settlements, Assets		(6)		(19)
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets	125	136	125	136
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(1)	4	2	11
Short Term Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	6	21	27
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Assets			12
Settlements, Assets			(23)
Purchases, Sales, Issuances and Settlements, Assets		(8)		12
Transfers into Level 3, Assets				1
Transfers out of Level 3, Assets		(11)	(10)	(11)
Balance, Ending, Assets	6	2	6	2
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30
Other Invested Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	10		26
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets		2	3	2
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Assets
Sales, Assets			(19)
Settlements, Assets
Purchases, Sales, Issuances and Settlements, Assets		26		26
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets	10	28	10	28
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30		2	1	2
Separate Account Business [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets	37	37	41	38
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets
Purchases, Assets
Sales, Assets	(2)		(6)
Settlements, Assets
Purchases, Sales, Issuances and Settlements, Assets		4		3
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets	35	41	35	41
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30
Derivative Instruments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning, Assets			(21)	(48)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Assets			(32)	(18)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Assets			(5)	27
Purchases, Assets
Settlements, Assets			30
Purchases, Sales, Issuances and Settlements, Assets				26
Transfers into Level 3, Assets
Transfers out of Level 3, Assets
Balance, Ending, Assets	(28)	(13)	(28)	(13)
Unrealized Gains (Losses) Recognized in Net Income on Level 3 Assets and Liabilities Held at September 30	(1)		(1)
Balance, Beginning, Liabilities	(37)	4
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in Net Income, Liabilities	(13)	(3)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses) Included in OCI, Liabilities	11	(15)
Settlements, Liabilities	11
Purchases, Sales, Issuances and Settlements, Liabilities		1
Balance, Ending, Liabilities	$ (28)	$ (13)	$ (28)	$ (13)