Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			$ 845
Increases Attributable To
Gross OTTI recognized in OCI during the year	$ (12)	$ (5)	(48)	$ (23)
Less:
Balance as of end-of-period	3,377		3,377
Unrealized Gain (Loss) on AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			991	3,175
Unrealized holding gains (losses) arising during the year			5,827	(2,870)
Change in foreign currency exchange rate adjustment			(47)	(35)
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds			(1,733)	841
Income tax benefit (expense)			(1,429)	713
Less:
Reclassification adjustment for gains (losses) included in net income (loss)			(131)	175
Associated amortization of DAC, VOBA, DSI, and DFEL			(14)	(23)
Income tax benefit (expense)			51	(53)
Less:
Balance as of end-of-period	3,703	1,725	3,703	1,725
Unrealized OTTI on AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			26	64
Increases Attributable To
Gross OTTI recognized in OCI during the year			(48)	(23)
Change in DAC, VOBA, DSI and DFEL			11	3
Income tax benefit (expense)			12	7
Decreases attributable to
Changes in fair value, sales, maturities or other settlements of AFS securities			40	31
Change in DAC, VOBA, DSI, and DFEL			(8)	(13)
Income tax benefit (expense)			(11)	(6)
Less:
Balance as of end-of-period	22	63	22	63
Unrealized Gain (Loss) on Derivative Instruments [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			132	139
Change in foreign currency exchange rate adjustment			42	35
Decreases attributable to
Unrealized holding gains (losses) arising during the year			(297)	(200)
Change in DAC, VOBA, DSI and DFEL				1
Income tax benefit (expense)			89	57
Less:
Reclassification adjustment for gains (losses) included in net income (loss)			12	(187)
Associated amortization of DAC, VOBA, DSI and DFEL			(1)	2
Income tax benefit (expense)			(4)	65
Balance as of end-of-period	(41)	152	(41)	152
Foreign Currency Translation Adjustment [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(5)	(3)
Change in foreign currency exchange rate adjustment			(15)	1
Less:
Balance as of end-of-period	(20)	(2)	(20)	(2)
Funded Status of Employee Benefit Plans [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year			(299)	(279)
Less:
Adjustment arising during the period			12	5
Income tax benefit (expense)				(1)
Balance as of end-of-period	$ (287)	$ (275)	$ (287)	$ (275)