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Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Unrealized Gain (Loss) on AFS Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year $ 9,611 $ 5,983
Income tax benefit (expense) 640 (652)
Less:    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (4) (48)
Associated amortization of DAC, VOBA, DSI, and DFEL (18) 42
Income tax benefit (expense) 5 1
Balance as of end-of-period 7,260 8,425
Unrealized Gain (Loss) on AFS Securities [Member] | Gains (Losses) Arising During The Year [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications and taxes (4,244) 5,426
Unrealized Gain (Loss) on AFS Securities [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications and taxes (123) 21
Unrealized Gain (Loss) on AFS Securities [Member] | Change in Deferred Insurance Charges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications and taxes 1,359 (2,403)
Unrealized OTTI on AFS Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year   45
Unrealized Gain (Loss) on Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year (402) (11)
Change in DAC, VOBA, DSI and DFEL (64)
Income tax benefit (expense) (76) 62
Less:    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 16 38
Associated amortization of DAC, VOBA, DSI, and DFEL (1) (8)
Income tax benefit (expense) (3) (6)
Balance as of end-of-period (132) (272)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Gains (Losses) Arising During The Year [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications and taxes 229 (219)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications and taxes 129 (16)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Change in Deferred Insurance Charges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications and taxes   (64)
Foreign Currency Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year (12) (17)
Other comprehensive income (loss) before reclassifications and taxes (2) (4)
Less:    
Balance as of end-of-period (14) (21)
Funded Status of Employee Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year (266) (327)
Other comprehensive income (loss) before reclassifications and taxes 1 4
Less:    
Balance as of end-of-period $ (265) (323)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized Gain (Loss) on AFS Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year   45
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized OTTI on AFS Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance as of beginning-of-year   $ (45)