Segment Information - Reconciliation of Information Reported by Segment to Condensed Consolidated Statement of Comprehensive Income Amounts (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Revenue:
Revenue		$ 2,223	$ 2,341
Amortization		(48)	(60)
Restructuring costs		0	(18)
Income from operations		432	280
Interest expense		(65)	(64)
Other (loss)/income, net		(64)	26
Income from operations before income taxes and interest in earnings of associates		303	242
Operating Segments [Member]
Revenue:
Revenue		2,192	2,314
Income from operations		537	539
Segment Reconciling Items [Member]
Revenue:
Revenue		31	27
Amortization		(48)	(60)
Restructuring costs	[1]	0	(18)
Transaction and transformation	[2]	0	(125)
Unallocated, net	[3]	(57)	(56)
Income from operations		432	280
Interest expense		(65)	(64)
Other (loss)/income, net		$ (64)	$ 26

[1] Consists of costs associated with our Transformation program, which concluded during the fourth quarter of 2024.

[2] In addition to legal fees and other transaction costs, includes primarily consulting fees related to the Transformation program (see Note 6 — Restructuring Costs).

[3] Includes certain costs, primarily related to corporate functions which are not directly related to the segments, and certain differences between budgeted expenses determined at the beginning of the year and actual expenses that we report for U.S. GAAP purposes.