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Supplementary Information (Schedule of Foreign Exchange Gain (Loss)) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Sep. 30, 2016 | Aug. 31, 2017 | Sep. 30, 2016
Successor |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Net exchange (losses) gains | $ 77 |  |  |  |
Net exchange (losses) gains, tax | (71) |  |  |  |
Net exchange (losses) gains, after-tax | 6 |  |  |  |
Successor | Subsidiary Monetary Position Gain (Loss) [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Net exchange (losses) gains | (35) |  |  |  |
Net exchange (losses) gains, tax | (31) |  |  |  |
Net exchange (losses) gains, after-tax | (66) |  |  |  |
Successor | Hedging Program Gain (Loss) [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Net exchange (losses) gains | 112 |  |  |  |
Net exchange (losses) gains, tax | (40) |  |  |  |
Net exchange (losses) gains, after-tax | $ 72 |  |  |  |
Predecessor |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Net exchange (losses) gains |  | $ (195) | $ (76) | $ (394) | $ (212)
Net exchange (losses) gains, tax |  | 182 | 48 | 372 | 114
Net exchange (losses) gains, after-tax |  | (13) | (28) | (22) | (98)
Predecessor | Subsidiary Monetary Position Gain (Loss) [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Net exchange (losses) gains |  | 65 | 6 | 37 | 185
Net exchange (losses) gains, tax |  | 88 | 18 | 217 | (29)
Net exchange (losses) gains, after-tax |  | 153 | 24 | 254 | 156
Predecessor | Hedging Program Gain (Loss) [Member] |  |  |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |  |  |
Net exchange (losses) gains |  | (260) | (82) | (431) | (397)
Net exchange (losses) gains, tax |  | 94 | 30 | 155 | 143
Net exchange (losses) gains, after-tax |  | $ (166) | $ (52) | $ (276) | $ (254)

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- Definition Amount after tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References No definition available. + Details
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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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