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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps $ 11,409   $ 11,391
Estimated Fair Value of Credit Default Swaps 195   82
Estimated Fair Value Assets 8,822   8,969
Estimated Fair Value Liabilities 3,816   3,930
Excess securities collateral received on derivatives 139   $ 135
Derivative Instrument Detail [Abstract]      
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges $ 1 $ 0  
Hedging exposure to variability in future cash flows for specific length of time 9 years   4 years
Accumulated Other Comprehensive Income Loss $ 2,100   $ 0
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 178   184
Excess securities collateral provided on derivatives 275   226
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0    
Nonperformance Risk [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net derivatives gains (losses) (62) $ 20  
Over the Counter [Member]      
Derivatives, Fair Value [Line Items]      
Excess securities collateral received on derivatives (74)   (70)
Excess securities collateral provided on derivatives (173)   (212)
Cash collateral on derivative assets (3,613)   (4,709)
Exchange-traded      
Derivatives, Fair Value [Line Items]      
Excess securities collateral received on derivatives (639)   (601)
Excess securities collateral provided on derivatives (115)   (90)
Cash collateral on derivative assets 0   0
Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets 101   99
Estimated Fair Value Liabilities $ (7)   $ (59)