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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivatives, Fair Value [Line Items]            
Estimated Fair Value Assets $ 11,175     $ 11,175   $ 8,080
Estimated Fair Value Liabilities 1,694     1,694   2,102
Maximum Amount of Future Payments under Credit Default Swaps 6,860     6,860   8,711
Credit Risk Derivative Assets, at Fair Value 89     89    
Estimated Fair Value of Credit Default Swaps           199
Derivative Instrument Detail [Abstract]            
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges 13   $ 2 $ 45 $ 51  
Hedging exposure to variability in future cash flows for specific length of time   8 years   9 years    
Accumulated Other Comprehensive Income Loss 4,000     $ 4,000   2,000
Deferred net gains (losses) expected to be reclassified to earnings       93    
Excess cash collateral received on derivatives 264     264   290
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0     0    
Over the Counter [Member]            
Derivatives, Fair Value [Line Items]            
Cash collateral on derivative assets (8,464)     (8,464)   (4,808)
Excess securities collateral received on derivatives 167     167   97
Excess securities collateral provided on derivatives 63     63   48
Exchange Traded [Member]            
Derivatives, Fair Value [Line Items]            
Cash collateral on derivative assets 0     0   0
Excess securities collateral received on derivatives 1,400     1,400   462
Excess securities collateral provided on derivatives 195     195   90
Nonperformance Risk [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Embedded derivative gains (losses) (12)   $ 20 53 $ 9  
Accrued Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Estimated Fair Value Assets 112     112   85
Estimated Fair Value Liabilities $ (2)     $ (2)   $ (9)