Taxes - Schedule for Principal Reasons for Difference in Effective and Statutory Tax Rates (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amount
U.S. federal statutory tax rate	$ 4,825	$ 3,567	$ 5,937
State and local income taxes, net of federal income tax effect	566	664	1,104
Foreign tax effects	(68)	(16)	(120)
Effect of cross-border tax laws	0	18	15
Tax credits	(27)	(27)	(30)
Changes in valuation allowances	15	0	11
Nontaxable or nondeductible items
Goodwill impairment	0	1,149	0
Other	(116)	(133)	(145)
Changes in unrecognized tax benefits	40	(27)	(118)
Other adjustments
Federal refund claims	(17)	(245)	0
Other	(188)	(58)	(131)
Total income tax provision	$ 5,030	$ 4,892	$ 6,523
Percent
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax effect	2.50%	3.90%	3.90%
Foreign tax effects	(0.30%)	(0.10%)	(0.40%)
Effect of cross-border tax laws	0.00%	0.10%	0.10%
Tax credits	(0.10%)	(0.20%)	(0.10%)
Changes in valuation allowances	0.10%	0.00%	0.00%
Nontaxable or nondeductible items
Goodwill impairment	0.00%	6.80%	0.00%
Other	(0.50%)	(0.80%)	(0.50%)
Changes in unrecognized tax benefits	0.20%	(0.20%)	(0.40%)
Other adjustments
Federal refund claims	(0.10%)	(1.40%)	0.00%
Other	(0.90%)	(0.30%)	(0.50%)
Effective income tax rate	21.90%	28.80%	23.10%