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Business Acquisitions, Investments and Restructuring Charges - Acquisitions (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Purchase price:      
Cash used in acquisitions, net of cash acquired of $7 and $1, respectively $ 1,259 $ 400  
Excess purchase price allocated as follows:      
Goodwill 16,699   $ 15,982
Business Combination, Series of Individually Immaterial Business Combinations      
Purchase price:      
Cash acquired 7 1  
Cash used in acquisitions, net of cash acquired of $7 and $1, respectively 977 77  
Holdbacks 18 0  
Fair value, future minimum finance lease payments 1 0  
Total 996 77  
Allocated as follows:      
Accounts receivable 28 4  
Prepaid expenses 2 0  
Property and equipment 180 30  
Operating right-of-use lease assets 15 0  
Other assets 3 0  
Accounts payable (5) 0  
Deferred revenue (1) (1)  
Environmental remediation liabilities (12) 0  
Closure and post-closure liabilities (1) 0  
Operating right-of-use lease liabilities (15) 0  
Deferred income tax liabilities (16) (1)  
Other liabilities (3) (1)  
Fair value of tangible assets acquired and liabilities assumed 175 31  
Excess purchase price to be allocated 821 46  
Excess purchase price allocated as follows:      
Other intangible assets 119 14  
Goodwill 702 32  
Total allocated $ 821 $ 46