Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (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
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			$ 3,808
Increases Attributable To
Gross OTTI recognized in OCI	(4)	(17)	(10)	(96)
Less:
Balance as of end-of-period	1,750		1,750
Unrealized Gain (Loss) On AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			4,066	2,947
Unrealized holding gains (losses) arising during the period			(5,145)	2,804
Change in foreign currency exchange rate adjustment			10	9
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds			1,685	(724)
Income tax benefit (expense)			1,208	(779)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)			(51)	(148)
Associated amortization of DAC, VOBA, DSI, and DFEL			(20)	1
Income tax benefit (expense)			25	51
Less:
Balance as of end-of-period	1,870	4,353	1,870	4,353
Unrealized OTTI On AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(107)	(110)
Increases Attributable To
Gross OTTI recognized in OCI			(10)	(96)
Change in DAC, VOBA, DSI and DFEL			1	14
Income tax benefit (expense)			3	31
Decreases attributable to
Sales, maturities or other settlements of AFS securities			51	112
Change in DAC, VOBA, DSI, and DFEL			(6)	(14)
Income tax benefit (expense)			(16)	(35)
Less:
Balance as of end-of-period	(84)	(98)	(84)	(98)
Unrealized Gain (Loss) on Derivative Instruments [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			163	119
Change in foreign currency exchange rate adjustment			(12)	(7)
Decreases attributable to
Unrealized holding gains (losses) arising during the year			161	80
Change in DAC, VOBA, DSI and DFEL			6	9
Income tax benefit (expense)			(54)	(30)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)			(11)	(11)
Associated amortization of DAC, VOBA, DSI and DFEL			1	2
Income tax benefit (expense)			4	3
Balance as of end-of-period	270	177	270	177
Foreign Currency Translation Adjustment [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(4)	1
Change in foreign currency exchange rate adjustment			(1)	(6)
Less:
Income tax benefit (expense)				2
Balance as of end-of-period	(5)	(3)	(5)	(3)
Funded Status Of Employee Benefit Plans [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(310)	(278)
Less:
Adjustment arising during the period			17	(2)
Income tax benefit (expense)			(8)	1
Balance as of end-of-period	$ (301)	$ (279)	$ (301)	$ (279)