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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |  |
Valuation allowance, decrease |  |  | $ 2 |  |
Valuation allowance |  | $ 103 | 101 | $ 103 |
Income tax provision from change in valuation allowance |  |  | 1 |  |
Tax Act, provisional income tax benefit |  | 275 |  | 275 |
Tax Act, measurement period adjustment, tax expense | $ 19 |  | 19 |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | 35 |  |
Expected significant change in unrecognized tax benefits |  |  | 3 |  |
Interest expense and penalties |  |  | 1 | 1 | $ 1
Accrued interest expense and penalties |  | $ 3 | 4 | $ 3 |
Federal |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carry-forwards |  |  | 27 |  |
State |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carry-forwards |  |  | 479 |  |
Foreign tax authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Net operating loss carry-forwards |  |  | 42 |  |
Net expiring and not expiring operating loss carry-forwards |  |  | $ 465 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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