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Financial Instruments Cash Flow Hedges Included in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Remaining Maturity |  |  | 2 years |
After-tax net loss to be reclassified from AOCL into earnings over the next twelve months |  |  | $ 5 |
Successor [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Additions and revaluations of derivatives designated as cash flow hedges | $ (15) |  | 1 |
Predecessor [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Additions and revaluations of derivatives designated as cash flow hedges |  | $ 0 |  | $ 4
Cash Flow Hedging [Member] | Successor [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Beginning Balance | 9 |  | (2) |
Additions and revaluations of derivatives designated as cash flow hedges | (12) |  | 0 |
Clearance of hedge results to earnings | (4) |  | (5) |
Ending Balance | $ (7) |  | $ (7) |
Cash Flow Hedging [Member] | Predecessor [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Beginning Balance |  | 4 |  | 7
Additions and revaluations of derivatives designated as cash flow hedges |  | 0 |  | 2
Clearance of hedge results to earnings |  | (8) |  | (13)
Ending Balance |  | $ (4) |  | $ (4)

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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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 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 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=84234895&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=84234895&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=84234895&loc=SL5624171-113959 + 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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