Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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 during the year	(30)	$ (12)	$ (11)
Less:
Balance as of end-of-period	845	3,096
Parent Company [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	3,096
Less:
Balance as of end-of-period	845	3,096
Unrealized Gain (Loss) on AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	3,213	1,538	4,020
Unrealized holding gains (losses) arising during the year	(4,541)	3,855	(5,766)
Change in foreign currency exchange rate adjustment	(45)	(47)	19
Change in DAC, VOBA, DSI, future contract benefits and other contract holder funds	1,294	(1,252)	1,834
Income tax benefit (expense)	1,147	(895)	1,369
Less:
Reclassification adjustment for gains (losses) included in net income (loss)	145	10	(67)
Associated amortization of DAC, VOBA, DSI, and DFEL	(27)	(32)	(29)
Income tax benefit (expense)	(41)	8	34
Less:
Balance as of end-of-period	991	3,213	1,538
Unrealized OTTI on AFS Securities [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	26	(7)	(61)
Increases Attributable To
Gross OTTI recognized in OCI during the year	(30)	(12)	(11)
Change in DAC, VOBA, DSI and DFEL	4	2	1
Income tax benefit (expense)	9	4	4
Decreases attributable to
Changes in fair value, sales, maturities or other settlements of AFS securities	43	65	100
Change in DAC, VOBA, DSI, and DFEL	(17)	(5)	(8)
Income tax benefit (expense)	(9)	(21)	(32)
Less:
Balance as of end-of-period	26	26	(7)
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	163
Unrealized holding gains (losses) arising during the year	(241)	(250)	143
Change in foreign currency exchange rate adjustment	48	50	(19)
Decreases attributable to
Change in DAC, VOBA, DSI and DFEL	2	2	5
Income tax benefit (expense)	66	69	(45)
Less:
Reclassification adjustment for gains (losses) included in net income (loss)	(183)	(19)	(15)
Associated amortization of DAC, VOBA, DSI and DFEL	1	1	1
Income tax benefit (expense)	64	6	5
Balance as of end-of-period	132	139	256
Foreign Currency Translation Adjustment [Member]
Components And Changes In Accumulated Other Comprehensive Income [Line Items]
Balance as of beginning-of-year	(3)	(5)	(4)
Change in foreign currency exchange rate adjustment	(2)	2	(1)
Less:
Balance as of end-of-period	(5)	(3)	(5)
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)	(310)
Less:
Adjustment arising during the period	(21)	(96)	140
Income tax benefit (expense)	1	36	(49)
Balance as of end-of-period	$ (299)	$ (279)	$ (219)