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Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Maturities [Abstract]    
2019 $ 46,519  
2020 23,110  
2021 15,937  
2022 15,606  
2023 7,370  
Thereafter 8,968  
DebtAndCapitalLeaseObligationTotal 117,510  
Total debt 117,717 $ 137,677
Total unamortized discount 29 30
Unamortized debt issuance costs (212) (252)
Total fair value adjustments 390 $ 1,467
Unsecured Debt [Member]    
Debt Maturities [Abstract]    
2019 27,761  
2020 11,319  
2021 10,730  
2022 8,870  
2023 5,150  
Thereafter 8,268  
Total debt 72,098  
Asset-backed Securities [Member]    
Debt Maturities [Abstract]    
2019 18,758  
2020 11,791  
2021 5,207  
2022 6,736  
2023 2,220  
Thereafter 700  
Total debt 45,412  
Short-term debt [Member]    
Debt Maturities [Abstract]    
2019 14,810  
Long-term debt [Member]    
Debt Maturities [Abstract]    
2019 $ 31,709