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Federal, State and Local Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |
Income tax expense | $ 210,000,000 | $ 77,000,000 | $ 128,000,000 |
CARES Act allowance of net operating losses |  | 5 years |  |
Outstanding amount of the investment | 76,000,000 | $ 85,000,000 |  |
Other commitments of additional anticipated equity contributions relating to current investments | 34,000,000 | 54,000,000 |  |
Affordable housing tax credits and other tax benefits recognized | 9,000,000 | 8,000,000 | 6,000,000 |
Affordable housing tax credits and other tax benefits, related amortization recognized | 9,000,000 | 6,000,000 | 5,000,000 |
Impairment losses on other assets | 0 | 0 | 0 |
Unrecognized gross tax benefits | 39,000,000 | 38,000,000 | 36,000,000 | $ 33,000,000
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized | 30,000,000 |  |  |
Income tax benefit attributed to interest and penalties | 4,000,000 | 3,000,000 | $ 3,000,000 |
Accrued interest and penalties on tax liabilities | 22,000,000 | 18,000,000 |  |
Net deferred tax liabilities | 384,000,000 | 420,000,000 |  |
Special Federal Tax Provision |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax bad debt base-year reserves | 62,000,000 |  |  |
Net deferred tax liabilities | 13,000,000 |  |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated change in balance of unrecognized tax benefit, within next twelve months | 21,000,000 |  |  |
CARES Act |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense |  | $ 68,400,000 |  |
Domestic Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 21,000,000 |  |  |
Operating loss carryforward period | 20 years |  |  |

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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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