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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Income tax rate | 26.10% | 24.40% | 26.30% | 25.40%
Valuation Allowance Rollforward [Roll Forward] |  |  |  |
Balance at beginning of year |  |  | $ 2,817 |
Additions to valuation allowance charged to income tax expense |  |  | 233 |
Reductions to valuation allowance credited to income tax benefit |  |  | (49) |
Foreign currency translation |  |  | (4) |
Balance at end of period | $ 2,997 |  | $ 2,997 |

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- Definition Valuation Allowance, Deferred Tax Asset, Increase In Amount + References No definition available. + Details
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- Definition Valuation Allowance, Foreign Currency Translation Adjustment + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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