Acquisitions and Divestitures - Allocation (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Nov. 04, 2024
Purchase price allocation
Goodwill	$ 13,894	$ 13,438
Allowance for doubtful accounts	122	$ 165
2025 Business Acquisitions [Member]
Purchase price allocation
Property and equipment	91
Goodwill	322
Other intangible assets	45
Stericycle [Member]
Purchase price allocation
Cash and cash equivalents	198
Accounts and other receivables	462
Parts and supplies	19
Other current assets	62
Assets held for sale	120
Property and equipment	747
Goodwill	3,764		$ 3,800
Other intangible assets	3,482		3,482
Other assets	610
Accounts payable	(185)
Accrued liabilities	(362)
Deferred revenues	(77)
Current portion of long-term debt	(5)
Liabilities held for sale	(35)
Long-term debt, less current portion	(510)
Deferred income taxes	(845)
Other liabilities	(542)
Total purchase price	6,903
Stericycle [Member] | Previously Reported [Member]
Purchase price allocation
Cash and cash equivalents			198
Accounts and other receivables			506
Parts and supplies			19
Other current assets			64
Assets held for sale			125
Property and equipment			782
Goodwill			3,633
Other intangible assets			3,536
Other assets			619
Accounts payable			(186)
Accrued liabilities			(336)
Deferred revenues			(77)
Current portion of long-term debt			(5)
Liabilities held for sale			(35)
Long-term debt, less current portion			(510)
Deferred income taxes			(884)
Other liabilities			(542)
Total purchase price			$ 6,907
Stericycle [Member] | Revision of Prior Period, Adjustment [Member]
Purchase price allocation
Accounts and other receivables	(44)
Other current assets	(2)
Assets held for sale	(5)
Property and equipment	(35)
Goodwill	131
Other intangible assets	(54)
Other assets	(9)
Accounts payable	1
Accrued liabilities	(26)
Deferred income taxes	39
Total purchase price	$ (4)