Accounts Receivable - Allowance for Credit Losses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 12,243	$ 10,756	$ 13,567
Tax effect	527	561	671
RETAINED EARNINGS
Financing Receivable, Allowance for Credit Loss [Line Items]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 2,193	$ 706	$ 3,517	$ 1,598