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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, due within one year $ 3,251 $ 5,869
Long-term debt, due after one year 13,377 11,160
Long-term debt 16,628 17,029
Secured debt 14,627 7,619
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 828 1,028
Long-term debt, due after one year 8,373 8,382
Long-term debt 9,201 9,410
Secured debt    
Debt Instrument [Line Items]    
Long-term debt, due within one year 2,423 4,841
Long-term debt, due after one year 5,004 2,778
Long-term debt 7,427 7,619
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Secured debt $ 6,100 $ 6,300