Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	$ 1,563
Increases Attributable To
Gross OTTI recognized in OCI during the year	(12)	(11)	(121)
Less:
Balance as of end-of-year	3,096	1,563
Parent Company [Member]
Less:
Balance as of end-of-year	3,096	1,563
Unrealized Gain (Loss) on AFS Securities
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	1,609	4,066	2,947
Unrealized holding gains (losses) arising during the year	3,877	(5,728)	2,691
Change in foreign currency exchange rate adjustment	(47)	19	14
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds	(1,252)	1,834	(1,233)
Income tax benefit (expense)	(904)	1,356	(480)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)	10	(67)	(194)
Associated amortization of DAC, VOBA, DSI, and DFEL	(32)	(29)	(2)
Income tax benefit (expense)	8	34	69
Less:
Balance as of end-of-year	3,297	1,609	4,066
Unrealized OTTI on AFS Securities
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	(78)	(107)	(109)
Increases Attributable To
Gross OTTI recognized in OCI during the year	(12)	(11)	(121)
Change in DAC, VOBA, DSI and DFEL	2	1	15
Income tax benefit (expense)	4	4	36
Decreases attributable to
Sales, maturities or other settlements of AFS securities	43	62	129
Change in DAC, VOBA, DSI, and DFEL	(5)	(8)	(18)
Income tax benefit (expense)	(12)	(19)	(39)
Less:
Balance as of end-of-year	(58)	(78)	(107)
Unrealized Gain (Loss) on Derivative Instruments
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	256	163	119
Change in foreign currency exchange rate adjustment	50	(19)	(12)
Decreases attributable to
Unrealized holding gains (losses) arising during the year	(250)	143	55
Change in DAC, VOBA, DSI and DFEL	2	5	15
Income tax benefit (expense)	69	(45)	(21)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)	(19)	(15)	(15)
Associated amortization of DAC, VOBA, DSI and DFEL	1	1	4
Income tax benefit (expense)	6	5	4
Balance as of end-of-year	139	256	163
Foreign Currency Translation Adjustment AOCI Disclosure
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	(5)	(4)	1
Change in foreign currency exchange rate adjustment	2	(1)	(5)
Less:
Balance as of end-of-year	(3)	(5)	(4)
Funded Status of Employee Benefit Plans AOCI Disclosure
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	(219)	(310)	(278)
Less:
Adjustment arising during the period	(96)	140	2
Income tax benefit (expense)	36	(49)	(34)
Balance as of end-of-year	$ (279)	$ (219)	$ (310)