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Long-Term Debt and Short-Term Borrowings - Future Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Maturities of long-term debt    
2021 $ 794  
2022 1,659  
2023 1,878  
2024 1,100  
2025 1,790  
After 2025 11,562  
Total long-term debt 18,783 $ 19,359
Floating rate note payments due in next twelve months $ 53