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Income Taxes - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |
Operating loss carryforward | $ 2,000 |  |  |
Tax credit carryforwards | 388 | $ 318 |  |
Tax credit carryforwards | 1,500 |  |  |
Valuation allowance (decrease) increase | 98 | 197 | $ 210 |
Total unrecognized tax benefit | 159 | 124 | $ 81 | $ 37
Unrecognized tax benefits that would impact effective tax rate | 31 |  |  |
Unrecognized tax benefits, income tax interest and penalties accrued | 5 | $ 4 |  |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforwards | 313 |  |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforwards | $ 229 |  |  |

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