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Long-Term Debt and Credit Facilities - Components of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt $ 7,206 $ 7,343
Less: Current portion of long-term debt (12) (9)
Total debt, excluding current portion of long-term debt $ 7,194 7,334
Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 1.90%  
Total debt $ 5,958 6,170
Commercial paper    
Debt Instrument [Line Items]    
Weighted average interest rate (0.40%)  
Total debt $ 1,204 1,139
Finance Lease Obligations    
Debt Instrument [Line Items]    
Total debt $ 44 $ 34