Intangible Assets Including Goodwill - Intangible Assets by Class (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Intangible asset balances by major asset class
Gross Carrying Amount	$ 22,038	$ 19,247
Accumulated Amortization	(10,309)	(8,587)
Net Carrying Amount	11,729	10,660
Amount of foreign currency translation increase (decrease)	187	(126)
Capitalized software
Intangible asset balances by major asset class
Gross Carrying Amount	1,349	1,282
Accumulated Amortization	(409)	(492)
Net Carrying Amount	940	790
Client relationships
Intangible asset balances by major asset class
Gross Carrying Amount	11,210	9,704
Accumulated Amortization	(5,362)	(4,387)
Net Carrying Amount	5,848	5,317
Completed technology
Intangible asset balances by major asset class
Gross Carrying Amount	7,353	6,297
Accumulated Amortization	(3,864)	(3,164)
Net Carrying Amount	3,489	3,132
Patents/trademarks
Intangible asset balances by major asset class
Gross Carrying Amount	2,005	1,826
Accumulated Amortization	(642)	(519)
Net Carrying Amount	1,362	1,307
Other
Intangible asset balances by major asset class
Gross Carrying Amount	121	138
Accumulated Amortization	(31)	(24)
Net Carrying Amount	$ 90	$ 114