Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)	$ (647)	$ (117)	$ (671)	$ (480)
Net investment income	1,172	1,355	2,547	2,606
Interest and debt expense	(84)	(70)	(152)	(141)
Commissions and other expenses	$ (1,123)	$ (1,272)	(2,207)	(2,446)
Unrealized Gain (Loss) on AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			(44)	(12)
Reclassifications before income tax benefit (expense)			18	(17)
Income tax benefit (expense)			(4)	4
Reclassifications, net of income tax			14	(13)
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)			62	(5)
Unrealized OTTI on AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)				5
Reclassifications before income tax benefit (expense)				5
Income tax benefit (expense)				(1)
Reclassifications, net of income tax				4
Unrealized Gain (Loss) on Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating income expense			23	20
Reclassifications before income tax benefit (expense)			4	18
Income tax benefit (expense)			(1)	(4)
Reclassifications, net of income tax			3	14
Unrealized Gain (Loss) on Derivative Instruments [Member] | Interest Rate Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income			1	2
Interest and debt expense			(8)	(1)
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)			8	4
Net investment income			22	15
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			$ (19)	$ (2)