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