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Debt and Capital Lease Obligations, Interest Incurred (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Interest and Debt Expense, Net of Capitalized Interest |  |
Interest and debt expense | $ 139 | $ 134
Less capitalized interest | 18 | 13
Interest and debt expense, net of capitalized interest | $ 121 | $ 121

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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