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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Income tax rate | 24.40% | 25.40% |
Income tax rate, change in enacted tax rate, percent | 1.20% | 1.10% |
Valuation Allowance Rollforward [Roll Forward] |  |  |
Balance at beginning of year |  | $ 2,324 |
Additions to valuation allowance charged to income tax expense |  | 32 |
Reductions to valuation allowance credited to income tax benefit |  | (141) |
Foreign currency translation |  | 5 |
Balance at end of year | $ 2,220 | 2,220 |
Unrecognized tax benefits | 66 | 66 | $ 64
Unrecognized tax benefits that would impact the effective tax rate | 40 | 40 | 40
Possible decrease in unrecognized tax benefits | 3 | 3 |
Unrecognized tax benefits that would impact deferred taxes | $ 26 | $ 26 | $ 24

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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 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 changes in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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