Intangible Assets Including Goodwill - Intangible Assets by Class (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Intangible asset balances by major asset class
Gross Carrying Amount	$ 26,006	$ 22,218
Accumulated Amortization	(11,382)	(10,827)
Net Carrying Amount	14,624	11,391
Amount of foreign currency translation increase (decrease)	(24)	182
Capitalized software
Intangible asset balances by major asset class
Gross Carrying Amount	1,419	1,388
Accumulated Amortization	(455)	(424)
Net Carrying Amount	963	964
Client relationships
Intangible asset balances by major asset class
Gross Carrying Amount	13,352	11,261
Accumulated Amortization	(5,878)	(5,602)
Net Carrying Amount	7,474	5,659
Completed technology
Intangible asset balances by major asset class
Gross Carrying Amount	8,953	7,399
Accumulated Amortization	(4,302)	(4,096)
Net Carrying Amount	4,651	3,304
Patents/trademarks
Intangible asset balances by major asset class
Gross Carrying Amount	2,143	2,030
Accumulated Amortization	(698)	(665)
Net Carrying Amount	1,445	1,365
Other
Intangible asset balances by major asset class
Gross Carrying Amount	139	139
Accumulated Amortization	(49)	(40)
Net Carrying Amount	$ 90	$ 99