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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivatives, Fair Value [Line Items]          
Maximum Amount of Future Payments under Credit Default Swaps $ 8,739   $ 8,739   $ 9,609
Credit Risk Derivative Assets, at Fair Value 175   175   196
Estimated Fair Value Assets 10,519   10,519   11,866
Estimated Fair Value Liabilities 3,751   3,751   4,229
Excess securities collateral received on derivatives 103   103   $ 265
Collateral Amount Not Provided Due to Downgrade Threshold 15   15    
Derivative Instrument Detail [Abstract]          
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges 6 $ (8) $ 5 $ 19  
Hedging exposure to variability in future cash flows for specific length of time     8 years   8 years
Accumulated Other Comprehensive Income Loss 2,000   $ 2,000   $ 1,900
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 253   253   164
Excess securities collateral provided on derivatives 158   158   238
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0   0    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     (137)    
Nonperformance Risk [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives gains (losses) 3 $ (12) (48) $ 63  
Over the Counter [Member]          
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives (98)   (98)   (231)
Excess securities collateral provided on derivatives (194)   (194)   (269)
Cash collateral on derivative assets (6,396)   (6,396)   (6,842)
Exchange-traded          
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives (1,200)   (1,200)   (2,100)
Excess securities collateral provided on derivatives (214)   (214)   (318)
Cash collateral on derivative assets 0   0   0
Accrued Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Estimated Fair Value Assets 83   83   92
Estimated Fair Value Liabilities $ (22)   $ (22)   $ (58)