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Long-Term Debt and Credit Facilities - Components of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total debt $ 7,343 $ 7,587
Less: Current portion of long-term debt (9) (254)
Total debt, excluding current portion of long-term debt $ 7,334 7,333
Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 1.90%  
Total debt $ 6,170 6,988
Commercial paper    
Debt Instrument [Line Items]    
Weighted average interest rate (0.30%)  
Total debt $ 1,139 579
Finance Lease Obligations    
Debt Instrument [Line Items]    
Total debt $ 34 $ 20