Intangible Assets Including Goodwill - Goodwill by Segment (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Changes in Goodwill Balances
Beginning Balance	$ 67,717	$ 60,706
Goodwill Additions	7,544	5,912
Purchase Price Adjustments	26	1
Divestitures	0	0
Foreign Currency Translation and Other Adjustments	(372)	1,098
Ending Balance	74,916	67,717
Goodwill impairment losses	0	0
Goodwill accumulated impairment losses	0	0
Software
Changes in Goodwill Balances
Beginning Balance	52,987	47,136
Goodwill Additions	7,153	5,004
Purchase Price Adjustments	12	(8)
Divestitures	0	0
Foreign Currency Translation and Other Adjustments	(310)	855
Ending Balance	59,843	52,987
Consulting
Changes in Goodwill Balances
Beginning Balance	10,341	9,206
Goodwill Additions	203	908
Purchase Price Adjustments	13	10
Divestitures	0	0
Foreign Currency Translation and Other Adjustments	(52)	217
Ending Balance	10,504	10,341
Infrastructure
Changes in Goodwill Balances
Beginning Balance	4,389	4,363
Goodwill Additions	189	0
Purchase Price Adjustments	1	0
Divestitures	0	0
Foreign Currency Translation and Other Adjustments	(10)	26
Ending Balance	$ 4,569	$ 4,389