Acquisitions and Divestitures (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Nov. 04, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Nov. 30, 2024
Business Acquisition
Debt repayments				$ 15,772	$ 10,619
Operating		$ (3,833)	$ (3,399)	(11,319)	(9,830)
Selling, general and administrative		$ (665)	$ (525)	(2,048)	$ (1,517)
Contingent consideration paid for acquisitions closed in previous year				8
Stericycle [Member]
Business Acquisition
Business acquisition cost (dollars per share)	$ 62
Total consideration, net of cash acquired	$ 7,200
Debt incurred for acquisition	500
Debt repayments	$ 800
Stericycle [Member] | Senior Notes, Aggregate [Member]
Business Acquisition
Debt instrument face amount						$ 5,200
2025 Business Acquisitions [Member]
Business Acquisition
Total consideration, net of cash acquired				442
Business acquisitions cash payments				399
Other consideration				$ 43