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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Total derivative assets $ 1,847   $ 1,906
Total derivative liabilities 1,575   792
Anticipated pre-tax gain (loss) reclassified from accumulated other comprehensive income (loss) to earnings $ 206    
Maximum Length of Time Hedged in Cash Flow Hedge (future cash flows) 10 years    
Net Investment Hedges income (loss) before taxes $ 11 $ 13  
Non-derivative Net Investment Hedges income (loss) before taxes 11 $ 0  
Credit Derivatives [Line Items]      
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 50   63
Credit Derivative Protection Purchased Notional Amount 1   307
Credit Default Swap, Buying Protection      
Credit Derivatives [Line Items]      
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) $ 0   $ (28)
Credit Default Swaps Referencing Indices      
Credit Derivatives [Line Items]      
Credit Derivatives Written Max Length Of Maturities (less than) 26 years