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Contingencies and Commitments (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 AUD ($) | Dec. 31, 2016 USD ($)
Contingencies and Commitments |  |  |
Damages sought |  | $ 1,470 |
Contracts receivable, claims and uncertain amounts | $ 124 |  | $ 61
Amount of disputed back charges | $ 18 |  | $ 41

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- Definition Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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