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Debt and Finance Lease Obligations, Interest Incurred (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest and Debt Expense, Net of Capitalized Interest      
Interest and debt expense $ 544 $ 557 $ 539
Less: Capitalized interest 90 87 71
Interest and debt expense, net of capitalized interest $ 454 $ 470 $ 468