Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Unrealized Gain (Loss) On AFS Securities [Member]	Mar. 31, 2012 Unrealized Gain (Loss) On AFS Securities [Member]	Mar. 31, 2013 Unrealized OTTI On AFS Securities [Member]	Mar. 31, 2012 Unrealized OTTI On AFS Securities [Member]	Mar. 31, 2013 Unrealized Gain (Loss) on Derivative Instruments [Member]	Mar. 31, 2012 Unrealized Gain (Loss) on Derivative Instruments [Member]	Mar. 31, 2013 Foreign Currency Translation Adjustment [Member]	Mar. 31, 2012 Foreign Currency Translation Adjustment [Member]	Mar. 31, 2013 Funded Status Of Employee Benefit Plans [Member]	Mar. 31, 2012 Funded Status Of Employee Benefit Plans [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	$ 3,581	$ 3,808	$ 4,066	$ 2,947	$ (107)	$ (109)	$ 163	$ 119	$ (4)	$ 1	$ (310)	$ (278)
Unrealized holding gains (losses) arising during the period			(732)	(109)			48	(42)
Change in foreign currency exchange rate adjustment			(13)	10			11	(9)
Change in DAC, VOBA, DSI and other contract holder funds			286	76
Income tax benefit (expense)			161	(27)
Less: Reclassification adjustment for gains (losses) included in net income (loss)			(6)	(57)
Less: Associated amortization of DAC, VOBA, DSI, and DFEL			(8)	2
Less: Income tax benefit (expense)			5	19
Increases attributable to: Gross OTTI recognized in OCI during the period					(7)	(58)
Increases attributable to: Change in DAC, VOBA, DSI and DFEL					1	8
Increases attributable to: Income tax benefit (expense)					2	18
Decreases attributable to: Sales, maturities or other settlements of AFS Securities					43	39
Decreases attributable to: Change in DAC, VOBA, DSI, and DFEL					(5)	(4)
Decreases attributable to: Income tax benefit (expense)					(14)	(12)
Change in DAC, VOBA, DSI and DFEL							2	4
Income tax benefit (expense)							(22)	15
Less: Reclassification adjustment for gains (losses) included in net income (loss)							(2)	(3)
Less: Associated amortization of DAC, VOBA, DSI and DFEL							1
Less: Income tax benefit (expense)								1
Foreign currency translation adjustment arising during the period									(3)	(5)
Income tax benefit (expense)									1	2
Adjustment arising during the period											6	(2)
Income tax benefit (expense)											(2)	1
Balance as of end-of-period	$ 3,581	$ 3,808	$ 3,777	$ 2,933	$ (87)	$ (118)	$ 203	$ 89	$ (6)	$ (2)	$ (306)	$ (279)