Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 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	(9)	(7)
Less:
Balance as of end-of-period	3,653
Unrealized Gain (Loss) On AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	3,297	1,609
Unrealized holding gains (losses) arising during the period	1,146	2,003
Change in foreign currency exchange rate adjustment	(34)	2
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds	(200)	(604)
Income tax benefit (expense)	(318)	(490)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)	184	2
Associated amortization of DAC, VOBA, DSI, and DFEL	(7)	(7)
Income tax benefit (expense)	(62)	2
Less:
Balance as of end-of-period	3,776	2,523
Unrealized OTTI On AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	(58)	(78)
Increases Attributable To
Gross OTTI recognized in OCI	(9)	(7)
Change in DAC, VOBA, DSI and DFEL	2
Income tax benefit (expense)	3	2
Decreases attributable to
Sales, maturities or other settlements of AFS securities	1	7
Change in DAC, VOBA, DSI, and DFEL	(2)	(1)
Income tax benefit (expense)	(2)	(2)
Less:
Balance as of end-of-period	(65)	(79)
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	37	(2)
Decreases attributable to
Unrealized holding gains (losses) arising during the year	(108)	(30)
Income tax benefit (expense)	25	11
Less:
Reclassification adjustment for gains (losses) included in net income (loss)	(194)	(6)
Associated amortization of DAC, VOBA, DSI and DFEL	1
Income tax benefit (expense)	68	2
Balance as of end-of-period	218	239
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	(4)	(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	8	(1)
Income tax benefit (expense)	(1)
Balance as of end-of-period	$ (272)	$ (220)