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Shares And Stockholders' Equity (Schedule of Reclassifications Out Of AOCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total realized gain (loss) $ (513) $ (610) $ 141
Net investment income 5,510 5,223 5,085
Interest and debt expense (284) (326) (297)
Commissions and other expenses (5,064) (5,287) (4,763)
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) (53) (28) (42)
Reclassifications before income tax benefit (expense) (21) (40) (62)
Income tax benefit (expense) 4 8 13
Reclassifications, net of income tax (17) (32) (49)
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) 32 (12) (20)
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)   4 8
Reclassifications before income tax benefit (expense)   4 8
Income tax benefit (expense)   (1) (2)
Reclassifications, net of income tax   3 6
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 48 42 24
Reclassifications before income tax benefit (expense) 47 41 22
Income tax benefit (expense) (10) (9) (5)
Reclassifications, net of income tax 37 32 17
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 3 4
Interest and debt expense (16) (5) (7)
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) 6 9  
Net investment income 56 35 27
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 $ (1) $ (1) $ (2)