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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 482	$ 432	$ 935	$ 783
State income tax, at statutory rates, net of federal tax benefit	99	102	211	183
Tax credits and benefits, net of related expenses	(143)	(83)	(266)	(144)
Revaluation of tax related assets and liabilities	72	0	72	0
Exam resolutions	0	(32)	0	(97)
Tax-exempt income	(40)	(36)	(73)	(67)
Other items	2	62	36	134
Total income tax provision	$ 472	$ 445	$ 915	$ 792