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Basis of Presentation and Summary of Significant Accounting Policies - New accounting policy (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | $ 78 |  |  | $ (66) |  | $ 37 | $ 20 |  |
Other non operating income, net | $ 43 |  |  | 50 |  | $ 45 | $ 58 |  |
ASU 2017-07 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) |  | $ (5) | $ (7) | 9 | $ 2 |  |  | $ (1) | $ 24
Other non operating income, net |  | $ 5 | $ 7 | $ (9) | $ (2) |  |  | $ 1 | $ (24)

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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