Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)	$ (10)	$ (45)	$ (49)	$ (159)
Net investment income	1,262	1,199	2,499	2,371
Interest and debt expense	(63)	(68)	(127)	(136)
Commissions and other expenses	(1,034)	(978)	(2,048)	(1,953)
Income (loss) from continuing operations before taxes	533	414	1,008	650
Federal income tax expense (benefit)	122	89	162	114
Net income (loss)	$ 411	$ 325	846	536
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			(13)	(101)
Income (loss) from continuing operations before taxes			(24)	(108)
Federal income tax expense (benefit)			8	38
Net income (loss)			(16)	(70)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on AFS Securities [Member] | Associated amortization of DAC, VOBA, DSI and DFEL [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			(11)	(7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized OTTI on AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			(1)	1
Income (loss) from continuing operations before taxes			(1)	1
Net income (loss)			(1)	1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating income expense			7	9
Income (loss) from continuing operations before taxes			5	8
Federal income tax expense (benefit)			(2)	(3)
Net income (loss)			3	5
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] | Interest rate contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income			2	4
Interest and debt expense			(9)	(2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] | Foreign currency contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			5
Net investment income			9	7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member] | Associated amortization of DAC, VOBA, DSI and DFEL [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Commissions and other expenses			$ (2)	$ (1)