Goodwill and Intangible assets, net - Schedule of Intangible Asset Net Carrying Amount and Weighted Average Remaining Useful Lives (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Intangible Assets
Net Carrying Amount	$ 2,644
Total	2,644	$ 2,855
Customer-related and contract based intangibles
Intangible Assets
Net Carrying Amount	$ 2,289	$ 2,450
Weighted-average remaining useful lives (in years)	10 years 8 months 12 days	11 years 6 months
Technology related intangibles
Intangible Assets
Net Carrying Amount	$ 68	$ 97
Weighted-average remaining useful lives (in years)	1 year 9 months 18 days	2 years 7 months 6 days
Trade name
Intangible Assets
Net Carrying Amount	$ 287	$ 308
Weighted-average remaining useful lives (in years)	10 years 8 months 12 days	11 years 4 months 24 days