Income Taxes - Reconciliation of Expected Income Tax Expense at Federal Statutory Rate to the Applicable Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 453	$ 351
State income tax, at statutory rates, net of federal tax benefit	112	81
Tax credits and benefits, net of related expenses	(123)	(61)
Exam resolutions	0	(65)
Tax-exempt income	(33)	(31)
Other items	34	72
Total income tax provision	$ 443	$ 347