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Receivables - Maturities of Financing Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
2021 $ 11,529  
2022 2,535  
2023 1,978  
2024 1,306  
2025 813  
2026 and thereafter 296  
Financing receivables, net $ 18,457 $ 19,428