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Long-Term Debt and Credit Facilities - Components of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 7,587 $ 6,354
Less: Current portion of long-term debt (254) 0
Total debt, excluding current portion of long-term debt $ 7,333 $ 6,354
Weighted-average interest rate on short term borrowings 1.80% 5.30%
Scheduled maturities of long-term debt [Abstract]    
2020 $ 267  
2021 860  
2022 903  
2023 895  
2024 498  
Thereafter $ 3,595  
Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 2.20%  
Total debt $ 6,988 $ 5,820
Commercial paper    
Debt Instrument [Line Items]    
Weighted average interest rate (0.40%)  
Total debt $ 579 534
Finance Lease Obligations    
Debt Instrument [Line Items]    
Total debt $ 20  
Finance Lease Obligations    
Debt Instrument [Line Items]    
Total debt   $ 0