Income Taxes - Reconciliation of Beginning and Ending Balance of Total Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
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Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Reconciliation of beginning and ending balance of total unrecognized tax benefits | |||
| Balance, beginning period | $ 81 | $ 37 | $ 28 |
| Gross increases - tax positions in prior year | 5 | 6 | 1 |
| Gross decreases - tax positions in prior period | 0 | (1) | 0 |
| Gross increases - tax positions in current period | 38 | 39 | 8 |
| Lapse of statute of limitations | 0 | 0 | 0 |
| Settlements | 0 | 0 | 0 |
| Balance, end of period | $ 124 | $ 81 | $ 37 |
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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