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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, due within one year $ 4,173 $ 5,869
Long-term debt, due after one year 11,712 11,160
Long-term debt 15,885 17,029
Secured debt 11,030 7,619
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 384 1,028
Long-term debt, due after one year 8,421 8,382
Long-term debt 8,805 9,410
Secured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 3,789 4,841
Long-term debt, due after one year 3,291 2,778
Long-term debt 7,080 7,619
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Secured debt $ 6,300 $ 6,300