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Income Taxes - Domestic and Foreign (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 21, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Tax cuts and jobs act, provisional income tax benefit |  |  | $ 198 |  |  |  |
Tax cuts and jobs act, change in tax rate, provisional tax benefit |  |  | $ 210 |  |  |  |
U.S. federal statutory income tax rate | 21.00% |  |  | 21.00% | 35.00% | 35.00% | 35.00%
Tax cuts and jobs act, transition tax, provisional income tax expense |  |  |  |  | $ 12 |  |
Tax cuts and jobs act, measurement period adjustment, income tax benefit |  | $ 2 |  |  |  |  |
Tax cuts and jobs act, measurement period adjustment, change in tax rate, income tax benefit |  | 5 |  |  |  |  |
Tax cuts and jobs act, measurement period adjustment, reduction in transition tax |  | 1 |  |  |  |  |
Tax cuts and jobs act, measurement period adjustment, deductible expenses |  | $ 4 |  |  |  |  |
Domestic loss |  |  |  | $ (411) | (91) |  | $ (1,329)
Foreign income |  |  |  | 16 | 75 |  | 102
Income (Loss) Before Income Taxes |  |  |  | $ (395) | $ (16) |  | $ (1,227)

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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