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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Federal income tax at U.S. statutory rate | $ (48) | $ (584) | $ (1,357)
Foreign income tax rate differential | (9) | (30) | (40)
Goodwill impairment |  | 271 | 666
Reduction of FTC carryforwards |  | 184 |
Tax Benefit from CARES Act |  | (83) |
Change in deferred tax valuation allowance | 31 | (83) | 218
Nondeductible expenses | 17 | 44 | 61
Foreign dividends, net of foreign tax credits | 54 | 28 | 163
Change in uncertain tax positions | 13 | 20 | (60)
State income taxes - net of federal benefit | (1) | (4) | (16)
Income tax credits | (11) |  |
Other | (31) | (5) | (4)
Total income tax provision | $ 15 | $ (242) | $ (369)

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