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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Long-term debt, due within one year $ 4,574 $ 4,340
Long-term debt, due after one year 12,437 13,230
Long-term debt 17,011 17,570
Secured debt 6,449 10,443
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 1,934 1,409
Long-term debt, due after one year 8,628 9,015
Long-term debt 10,562 10,424
Secured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 2,640 2,931
Long-term debt, due after one year 3,809 4,215
Long-term debt 6,449 7,146
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Secured debt $ 5,100 $ 5,600