Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)	$ (11)	$ (55)	$ (491)	$ (51)
Net investment income	1,235	1,271	3,842	3,736
Interest and debt expense	(113)	(69)	(254)	(228)
Commissions and other expenses	$ (1,552)	$ (1,367)	(3,999)	(3,600)
Unrealized Gain (Loss) on AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			(18)	(35)
Reclassifications before income tax benefit (expense)			(29)	(50)
Income tax benefit (expense)			6	11
Reclassifications, net of income tax			(23)	(39)
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)	(15)
Unrealized OTTI on AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total realized gain (loss)			4	(1)
Reclassifications before income tax benefit (expense)			4	(1)
Income tax benefit (expense)			(1)
Reclassifications, net of income tax			3	(1)
Unrealized Gain (Loss) on Derivative Instruments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Nonoperating income expense			34	15
Reclassifications before income tax benefit (expense)			33	14
Income tax benefit (expense)			(7)	(3)
Reclassifications, net of income tax			26	11
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	3
Interest and debt expense			(2)	(6)
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)			9
Net investment income			25	18
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			$ (1)	$ (1)