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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Federal | $ 31 | $ 0 | $ 0
Effective income tax rate percent | 13.90% | 69.50% | 23.60%
Tax credit | $ 71 | $ 44 |
Valuation allowance | 83 | 54 |
Unrecognized tax benefits | 179 | 433 | $ 406
Unrecognized tax benefits that would impact effective tax rate | 179 |  |
Uncertain tax positions are recognized in other long-term liabilities | 35 | 30 |
Unrecognized tax benefits, increase resulting from interest | 1 | $ 6 |
Domestic Plan |  |  |
Income Tax Contingency [Line Items] |  |  |
Gross operating loss carryforwards | $ 643 |  |

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- Definition Amount 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 research tax credit. + References Reference 1: 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=121826272&loc=d3e32687-109319 + Details
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