Income Taxes - Schedule of Income Taxes Expenses Benefit Reconciliation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income taxes at statutory federal income tax rate	$ 695	$ 760	$ 548
Increase (decrease) in taxes:
Tax-exempt income	(53)	(51)	(37)
State and local income taxes, net of federal income tax effect	136	161	110
Tax benefits for investments in partnerships under proportional amortization method, net	(38)	(26)	(22)
Other	(18)	34	21
Total income taxes	$ 722	$ 878	$ 620