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Debt - Other Debt Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Weighted average interest rate of short term debt borrowings 0.00% 0.60%
Long-term Debt, Fiscal Year Maturity [Abstract]    
2021 $ 751  
2022 2,440  
2023 1,853  
2024 1,067  
2025 1,083  
Thereafter 5,709  
Carrying value of long-term debt including current portion $ 12,903 $ 12,224