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Acquisitions & Divestitures - Acquisitions (Details)
$ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
acquisition
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Acquisitions      
Goodwill $ 59,596 $ 55,949 $ 55,643
Software      
Acquisitions      
Goodwill 46,923 43,657 43,966
Consulting      
Acquisitions      
Goodwill 8,302 7,928 6,797
Infrastructure      
Acquisitions      
Goodwill $ 4,370 $ 4,363 $ 4,396
2023 Acquisitions      
Acquisitions      
Percentage of business acquired (as a percent) 100.00%    
Number of acquisitions | acquisition 7    
Aggregate acquisitions cost $ 5,033    
Cash consideration payable 38    
Apptio      
Acquisitions      
Goodwill $ 3,552    
Estimated percent of goodwill deductible for tax purposes 1.00%    
Weighted average useful life 8 years 7 months 6 days    
Apptio | Software      
Acquisitions      
Goodwill $ 3,180    
Apptio | Consulting      
Acquisitions      
Goodwill 372    
Other 2023 Acquisitions      
Acquisitions      
Goodwill $ 301    
Estimated percent of goodwill deductible for tax purposes 0.00%    
Weighted average useful life 6 years 8 months 12 days    
Other 2023 Acquisitions | Software      
Acquisitions      
Goodwill $ 266    
Other 2023 Acquisitions | Consulting      
Acquisitions      
Goodwill 23    
Other 2023 Acquisitions | Infrastructure      
Acquisitions      
Goodwill $ 12