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Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Successor [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 8 |  |  |
Foreign Currency Transaction Gain (Loss) Tax | (36) |  |  |
Foreign Currency Transaction Gain (Loss) After Tax | (28) |  |  |
Predecessor [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | $ (394) | $ (106) | $ 30
Foreign Currency Transaction Gain (Loss) Tax |  | 372 | (16) | (218)
Foreign Currency Transaction Gain (Loss) After Tax |  | (22) | (122) | (188)
Subsidiary Monetary Position | Successor [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | (83) |  |  |
Foreign Currency Transaction Gain (Loss) Tax | (3) |  |  |
Foreign Currency Transaction Gain (Loss) After Tax | (86) |  |  |
Subsidiary Monetary Position | Predecessor [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | 37 | 198 | (404)
Foreign Currency Transaction Gain (Loss) Tax |  | 217 | (126) | (61)
Foreign Currency Transaction Gain (Loss) After Tax |  | 254 | 72 | (465)
Hedging Program [Member] | Successor [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | 91 |  |  |
Foreign Currency Transaction Gain (Loss) Tax | (33) |  |  |
Foreign Currency Transaction Gain (Loss) After Tax | $ 58 |  |  |
Hedging Program [Member] | Predecessor [Member] |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | (431) | (304) | 434
Foreign Currency Transaction Gain (Loss) Tax |  | 155 | 110 | (157)
Foreign Currency Transaction Gain (Loss) After Tax |  | $ (276) | $ (194) | $ 277

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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