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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps $ 13,901   $ 12,468
Estimated Fair Value Assets 8,291   8,737
Estimated Fair Value Liabilities 6,985   6,298
Excess securities collateral received on derivatives 35   $ 163
Collateral Amount Not Provided Due to Downgrade Threshold 15    
Derivative Instrument Detail [Abstract]      
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges $ (10) $ 1  
Hedging exposure to variability in future cash flows for specific length of time 5 years   5 years
Accumulated Other Comprehensive Income Loss $ 182   $ 166
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 861   681
Excess securities collateral provided on derivatives 99   98
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (56)    
Over the Counter [Member]      
Derivatives, Fair Value [Line Items]      
Excess securities collateral received on derivatives (324)   (298)
Excess securities collateral provided on derivatives (1,400)   (1,500)
Cash collateral on derivative assets (3,195)   (3,448)
Exchange-traded      
Derivatives, Fair Value [Line Items]      
Excess securities collateral provided on derivatives (154)   (137)
Cash collateral on derivative assets 0   0
Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets 243   181
Estimated Fair Value Liabilities $ 86   $ 9