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Acquisitions and Divestitures (Detail) $ / shares in Units, $ in Millions		2 Months Ended	12 Months Ended
	Nov. 04, 2024 USD ($) $ / shares	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($) item	Nov. 30, 2024 USD ($)
Business Acquisition
Operating			$ (13,383)	$ (12,606)	$ (12,294)
Selling, general and administrative			(2,264)	(1,926)	(1,938)
Non-cash acquisition consideration			20	25	135
Senior Notes, Aggregate [Member]
Business Acquisition
Debt instrument face amount						$ 5,200
Stericycle [Member]
Business Acquisition
Business acquisition cost (dollars per share) | $ / shares	$ 62
Total consideration, net of cash acquired	$ 7,200
Debt incurred for acquisition	500
Debt instrument face amount	$ 800
Business acquisition costs incurred			160
Revenue since acquisition		$ 403
Operating		(244)
Selling, general and administrative		(155)
Aggregate smaller acquisitions [Member]
Business Acquisition
Total consideration, net of cash acquired			790	$ 182	$ 507
Number of business acquired | item				12	13
Business acquisitions cash payments			783	$ 157	$ 372
Non-cash acquisition consideration			7	25	135
Promissory notes receivable converted into equity					67
Contingent liability payments			23	13
Contingent consideration paid for acquisitions closed in previous year			16	$ 6	$ 5
Acquisition of remaining interest		$ 41	$ 41

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