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Recent Accounting Guidance Recent Accounting Guidance (Details) - Accounting Standards Update 2016-09 - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Aug. 31, 2017 | Sep. 30, 2016
Predecessor |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Excess tax benefits recognized |  | $ 5 | $ 30 |
Excess Tax Benefit from Share-based Compensation, Operating Activities |  |  |  | $ (22)
Excess Tax Benefit from Share-based Compensation, Financing Activities |  |  |  | (22)
Successor |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Excess tax benefits recognized | $ 0 |  |  |
Cash Flows from Operating Activities | Predecessor |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  | (28)
Cash Flows from Financing Activities | Predecessor |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  |  | $ (28)

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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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