Income Taxes (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
Dec. 31, 2018 |
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| Income Tax Disclosure [Abstract] | |||
| Effective tax rate on income from operations (percentage) | 27.00% | 20.00% | |
| Effective income tax rate, estimated (percentage) | 26.00% | ||
| Deferred tax assets, valuation allowance | $ 204 | $ 207 | |
| Change in valuation allowance | (3) | $ (1) | |
| Liabilities for uncertain tax positions | $ 90 | $ 90 | |
| X | ||||||||||
- Definition Effective Income Tax Rate, Estimated No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount recognized for uncertainty in income taxes classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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