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Debt, Interest Incurred (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Interest and Debt Expense, Net of Capitalized Interest |  |  |  |
Interest and debt expense | $ 133 | $ 134 | $ 405 | $ 417
Less capitalized interest | 22 | 23 | 70 | 61
Interest and debt expense, net of capitalized interest | $ 111 | $ 111 | $ 335 | $ 356

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