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Income Taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance - beginning of period | $ 0 |  |  |
Increases in tax positions of current year | 0 |  |  |
Increases in tax positions of prior years | 0 |  |  |
Decreases in tax positions of prior years | 0 |  |  |
Settlements | 0 |  |  |
Balance - end of period | 0 | $ 0 |  |
Predecessor |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance - beginning of period | $ 0 | 17 | $ 0 | $ 0
Increases in tax positions of current year |  | 0 | 1 | 0
Increases in tax positions of prior years |  | 0 | 20 | 0
Decreases in tax positions of prior years |  | (17) | 0 | 0
Settlements |  | 0 | (4) | 0
Balance - end of period |  | $ 0 | $ 17 | $ 0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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