Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			$ 3,096
Increases Attributable To
Gross OTTI recognized in OCI	$ (5)	$ (2)	(23)	$ (11)
Less:
Balance as of end-of-period	1,663		1,663
Unrealized Gain (Loss) On AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			3,175	1,500
Unrealized holding gains (losses) arising during the period			(2,870)	3,100
Change in foreign currency exchange rate adjustment			(35)	(21)
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds			841	(983)
Income tax benefit (expense)			713	(734)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)			175	10
Associated amortization of DAC, VOBA, DSI, and DFEL			(23)	(25)
Income tax benefit (expense)			(53)	5
Less:
Balance as of end-of-period	1,725	2,872	1,725	2,872
Unrealized OTTI On AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			64	31
Increases Attributable To
Gross OTTI recognized in OCI			(23)	(11)
Change in DAC, VOBA, DSI and DFEL			3	1
Income tax benefit (expense)			7	4
Decreases attributable to
Sales, maturities or other settlements of AFS securities			31	55
Change in DAC, VOBA, DSI, and DFEL			(13)	(7)
Income tax benefit (expense)			(6)	(17)
Less:
Balance as of end-of-period	63	56	63	56
Unrealized Gain (Loss) on Derivative Instruments [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			139	256
Change in foreign currency exchange rate adjustment			35	25
Decreases attributable to
Unrealized holding gains (losses) arising during the year			(200)	(92)
Change in DAC, VOBA, DSI and DFEL			1	2
Income tax benefit (expense)			57	23
Less:
Reclassification adjustment for gains (losses) included in net income (loss)			(187)	(12)
Associated amortization of DAC, VOBA, DSI and DFEL			2	1
Income tax benefit (expense)			65	4
Balance as of end-of-period	152	221	152	221
Foreign Currency Translation Adjustment [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(3)	(5)
Change in foreign currency exchange rate adjustment			1	(5)
Less:
Balance as of end-of-period	(2)	(10)	(2)	(10)
Funded Status Of Employee Benefit Plans [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(279)	(219)
Less:
Adjustment arising during the period			5	2
Income tax benefit (expense)			(1)
Balance as of end-of-period	$ (275)	$ (217)	$ (275)	$ (217)