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Long-Term Debt and Short-Term Borrowings - Future Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Maturities of long-term debt    
2020 $ 1,841  
2021 1,682  
2022 1,603  
2023 1,811  
2024 1,101  
After 2024 11,321  
Total long-term debt 19,359 $ 14,156
Floating rate note payments due in next twelve months $ 149