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Federal, State and Local Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |
Deferred tax asset for net operating loss | $ 15,000,000 | $ 1,000,000 |  |
Valuation allowance | 5,000,000 |  |  |
Income tax expense | 176,000,000 | 210,000,000 | $ 77,000,000 |
CARES Act allowance of net operating losses |  |  | 5 years |
Outstanding amount of the investment | 304,000,000 | 76,000,000 |  |
Other commitments of additional anticipated equity contributions relating to current investments | 183,000,000 | 34,000,000 |  |
Affordable housing tax credits and other tax benefits recognized | 11,000,000 | 9,000,000 | $ 8,000,000 |
Affordable housing tax credits and other tax benefits, related amortization recognized | 10,000,000 | 9,000,000 | 6,000,000 |
Impairment losses on other assets | 0 | 0 | 0 |
Unrecognized gross tax benefits | 40,000,000 | 39,000,000 | 38,000,000 | $ 36,000,000
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized | 32,000,000 |  |  |
Income tax benefit attributed to interest and penalties | 4,000,000 | 4,000,000 | 3,000,000 |
Accrued interest and penalties on tax liabilities | 26,000,000 | 22,000,000 |  |
Net deferred tax liabilities | 107,000,000 | $ 384,000,000 |  |
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 |
State Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred tax asset for net operating loss | 15,000,000 |  |  |
Net operating loss carryforward | $ 303,000,000 |  |  |
Operating loss carryforwards expiration year | 2033 |  |  |
Valuation allowance | $ 5,000,000 |  |  |

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