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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax [Line Items] |  |  |
Undistributed earnings of foreign subsidiaries | $ 6,000 |  |
Undistributed foreign earnings | 5 |  |
Unremitted earnings | 6,000 |  |
Operating loss carryforwards | 1,400 |  |
Operating loss carryforwards, not subject to expiration | 982 |  |
Operating loss carryforwards, subject to expiration | 434 |  |
Valuation allowance | 213 | $ 271 |
Valuation allowance, deferred tax asset, change in amount |  | 53 |
Unrecognized tax benefits that would impact effective tax rate | 387 | 437 | $ 444
Unrecognized tax benefits, income tax penalties and interest expense | 5 | 11 | $ 8
Decrease in unrecognized tax benefits | 4 |  |
Minimum |  |  |
Income Tax [Line Items] |  |  |
Potential income tax expense due to change in tax regulation | 180 |  |
Maximum |  |  |
Income Tax [Line Items] |  |  |
Potential income tax expense due to change in tax regulation | 220 |  |
Operations Deferred Tax Asset Deemed Realizable |  |  |
Income Tax [Line Items] |  |  |
Valuation allowance | 213 | 271 |
Valuation allowance, deferred tax asset, change in amount | (58) | $ 76 |
Domestic Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 249 |  |
Operating loss carryforwards, subject to expiration, varying limitations | 102 |  |
Operating loss carryforwards excluded from statement of financial condition | 98 |  |
Operating loss carryforwards utilized in the current year | 32 |  |
Domestic Tax Authority | Carryback 3 years, carryforward 5 years |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards, not subject to expiration | 755 |  |
Domestic Tax Authority | Tax year 2018 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards, not subject to expiration | 313 |  |
Domestic Tax Authority | Tax year 2020 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards, not subject to expiration | 442 |  |
Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 1,200 |  |
State Jurisdiction |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 292 |  |
Operating loss carryforwards, subject to expiration | 1,000 |  |
Operating loss carryforwards, subject to expiration, varying limitations | 38 |  |
Operating loss carryforwards excluded from statement of financial condition | 38 |  |
Operating loss carryforwards utilized in the current year | 6 |  |
State Jurisdiction | Carryback 3 years, carryforward 5 years |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 183 |  |
State Jurisdiction | Tax year 2018 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 136 |  |
State Jurisdiction | Tax year 2020 |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 156 |  |
State Jurisdiction | Five-year carryforward |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | $ 109 |  |

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