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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Tax Legislation expense (benefit) | $ 29,000,000 | $ 509,000,000 |
Effective income tax rate (as a percent) | 17.80% | 21.90% | 31.80%
Tax Legislation benefit | 1.10% | 11.20% | (0.00%)
Income tax penalties and interest expense |  | $ 0 | $ 0
Interest on income taxes accrued |  | 0 |
Income tax paid | $ 731,000,000 | 968,000,000 | $ 359,000,000
Current income tax payable | 124,000,000 | 44,000,000 |
Unrecognized tax benefits, income tax penalties accrued |  | $ 0 |
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in unrecognized tax benefits is reasonably possible | 58,000,000 |  |
Components of the net operating loss carryforwards as of December 31, 2018 | 239,000,000 |  |
US Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Components of the net operating loss carryforwards as of December 31, 2018 | 209,000,000 |  |
Foreign |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Components of the net operating loss carryforwards as of December 31, 2018 | $ 30,000,000 |  |

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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense + References No definition available. + Details
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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 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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