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Long-Term Debt and Credit Facilities - Interest Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Repayments of debt $ 3,600 $ 1,700  
Gross interest expense 2,093 2,230 $ 1,559
Capitalized interest (72) (53) (78)
Total interest expense $ 2,021 $ 2,177 $ 1,481