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, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 351	$ 453
State income tax, at statutory rates, net of federal tax benefit	81	102
Tax credits and benefits, net of related expenses	(61)	(77)
Exam resolutions	(65)	0
Tax-exempt income	(31)	(34)
Other items	72	11
Total income tax provision	$ 347	$ 455