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Long-Term Debt and Short-Term Borrowings - Post-Swap Borrowing, Long-Term Debt, Including Current Portion (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt instrument    
Carrying Value $ 17,347 $ 18,783
Fixed-rate debt    
Debt instrument    
Carrying Value $ 16,053 $ 17,889
Effective Interest Rate 2.80% 2.80%
Floating-rate debt    
Debt instrument    
Carrying Value $ 1,294 $ 894
Effective Interest Rate 1.43% 0.06%