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Long-Term Debt and Short-Term Borrowings - Future Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Maturities of long-term debt    
2022 $ 1,291  
2023 1,923  
2024 1,100  
2025 1,792  
2026 1,487  
After 2026 9,754  
Other borrowings 17,347 $ 18,783
Floating rate note payments due in next twelve months 124  
Floating rate note payments due in year two $ 95