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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Total derivative assets $ 1,103 $ 1,455  
Total derivative liabilities 4,181 3,055  
Anticipated pre-tax loss reclassified from accumulated other comprehensive income (loss) to earnings $ 293    
Maximum Length of Time Hedged in Cash Flow Hedge (future cash flows) 28 years    
Net investment hedges income (loss) before taxes $ 39 134 $ 16
Non-derivative AOCI Net Investment Hedge Before Tax 28 134 $ 25
Derivative [Line Items]      
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) 64 (31)  
Credit Derivative Protection Purchased Notional Amount 0 324  
Credit Default Swap, Buying Protection      
Derivative [Line Items]      
Credit Risk Derivatives, at Fair Value, Asset Net (Liability) $ 0 $ 1