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(Effect of Cash Flows Hedges on Accumulated Other Comprehensive Income (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, 2017 | Sep. 30, 2016
Derivative [Line Items] |  |  |  |  |  |
Derivative, Remaining Maturity |  |  |  |  | 2 years |
Successor |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Additions and revaluations of derivatives designated as cash flow hedges, after-tax | $ 0 |  |  |  |  |
Successor | Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Beginning balance, after-tax | 0 |  |  |  |  |
Additions and revaluations of derivatives designated as cash flow hedges, after-tax | 0 |  |  |  |  |
Clearance of hedge results to earnings, after-tax | 0 |  |  |  |  |
Ending balance, after-tax | 0 | $ 0 |  | $ 0 | $ 0 |
Predecessor |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Additions and revaluations of derivatives designated as cash flow hedges, after-tax |  | 1 | $ (3) | 5 |  | $ 34
Predecessor | Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Beginning balance, after-tax | $ (3) | (4) | 10 | 7 | $ 7 | (24)
Additions and revaluations of derivatives designated as cash flow hedges, after-tax |  | 1 | (2) | 3 |  | 21
Clearance of hedge results to earnings, after-tax |  | 0 | 0 | (13) |  | 11
Ending balance, after-tax |  | $ (3) | $ 8 | $ (3) |  | $ 8

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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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