Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Unrealized Gain (Loss) On AFS Securities [Member]	Jun. 30, 2012 Unrealized Gain (Loss) On AFS Securities [Member]	Jun. 30, 2013 Unrealized OTTI On AFS Securities [Member]	Jun. 30, 2012 Unrealized OTTI On AFS Securities [Member]	Jun. 30, 2013 Unrealized Gain (Loss) on Derivative Instruments [Member]	Jun. 30, 2012 Unrealized Gain (Loss) on Derivative Instruments [Member]	Jun. 30, 2013 Foreign Currency Translation Adjustment [Member]	Jun. 30, 2012 Foreign Currency Translation Adjustment [Member]	Jun. 30, 2013 Funded Status Of Employee Benefit Plans [Member]	Jun. 30, 2012 Funded Status Of Employee Benefit Plans [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	$ 1,893	$ 3,808	$ 4,066	$ 2,947	$ (107)	$ (110)	$ 163	$ 119	$ (4)	$ 1	$ (310)	$ (278)
Unrealized holding gains (losses) arising during the period			(4,635)	1,276
Change in foreign currency exchange rate adjustment			(16)	(6)			18	2
Change in DAC, VOBA, DSI and other contract holder funds			1,483	(261)
Income tax benefit (expense)			1,110	(395)
Less: Reclassification adjustment for gains (losses) included in net income (loss)			(27)	(103)
Less: Associated amortization of DAC, VOBA, DSI, and DFEL			(12)	1
Less: Income tax benefit (expense)			14	36
Increases attributable to: Gross OTTI recognized in OCI during the period					(7)	(79)
Increases attributable to: Change in DAC, VOBA, DSI and DFEL					1	12
Increases attributable to: Income tax benefit (expense)					2	26
Decreases attributable to: Sales, maturities or other settlements of AFS Securities					47	62
Decreases attributable to: Change in DAC, VOBA, DSI, and DFEL					(5)	(8)
Decreases attributable to: Income tax benefit (expense)					(15)	(20)
Unrealized holding gains (losses) arising during the period							120	37
Change in DAC, VOBA, DSI and DFEL							4	4
Income tax benefit (expense)							(49)	(16)
Less: Reclassification adjustment for gains (losses) included in net income (loss)							(6)	(7)
Less: Associated amortization of DAC, VOBA, DSI and DFEL							1	1
Less: Income tax benefit (expense)							2	2
Foreign currency translation adjustment arising during the period									(1)	(8)
Income tax benefit (expense)										3
Adjustment arising during the period												1
Balance as of end-of-period	$ 1,893	$ 3,808	$ 2,033	$ 3,627	$ (84)	$ (117)	$ 259	$ 150	$ (5)	$ (4)	$ (310)	$ (277)