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Debt and Capital Lease Obligations, Interest Incurred (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Interest and Debt Expense, Net of Capitalized Interest |  |  |  |
Interest and debt expense | $ 134 | $ 134 | $ 417 | $ 402
Less capitalized interest | 23 | 20 | 61 | 48
Interest and debt expense, net of capitalized interest | $ 111 | $ 114 | $ 356 | $ 354

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