Segment and Related Information - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 3,755	$ 3,549	$ 7,532	$ 7,040
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	745	777	1,595	1,570
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	3,010	2,772	5,937	5,470
Subscription
Disaggregation of Revenue [Line Items]
Revenue	1,954	1,821	3,851	3,600
Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	745	777	1,595	1,570
Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	502	463	983	899
Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	286	245	574	489
Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	110	96	221	194
Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	158	147	308	288
Reportable Legal Entities
Disaggregation of Revenue [Line Items]
Revenue	3,804	3,595	7,629	7,131
Reportable Legal Entities | Market Intelligence
Disaggregation of Revenue [Line Items]
Revenue	1,217	1,155	2,416	2,297
Reportable Legal Entities | Market Intelligence | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	42	43	98	97
Reportable Legal Entities | Market Intelligence | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,175	1,112	2,318	2,200
Reportable Legal Entities | Market Intelligence | Subscription
Disaggregation of Revenue [Line Items]
Revenue	1,017	965		1,912
Reportable Legal Entities | Market Intelligence | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	42	43		97
Reportable Legal Entities | Market Intelligence | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Market Intelligence | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Market Intelligence | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Market Intelligence | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	158	147		288
Reportable Legal Entities | Ratings
Disaggregation of Revenue [Line Items]
Revenue	1,148	1,135	2,297	2,197
Reportable Legal Entities | Ratings | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	597	626	1,217	1,207
Reportable Legal Entities | Ratings | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	551	509	1,080	990
Reportable Legal Entities | Ratings | Subscription
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Ratings | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	597	626		1,207
Reportable Legal Entities | Ratings | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	551	509		990
Reportable Legal Entities | Ratings | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Ratings | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Ratings | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Commodity Insights
Disaggregation of Revenue [Line Items]
Revenue	555	516	1,167	1,075
Reportable Legal Entities | Commodity Insights | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	25	31	122	115
Reportable Legal Entities | Commodity Insights | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	530	485	1,045	960
Reportable Legal Entities | Commodity Insights | Subscription
Disaggregation of Revenue [Line Items]
Revenue	500	459		909
Reportable Legal Entities | Commodity Insights | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	25	31		115
Reportable Legal Entities | Commodity Insights | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Commodity Insights | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Commodity Insights | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	30	26		51
Reportable Legal Entities | Commodity Insights | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Mobility
Disaggregation of Revenue [Line Items]
Revenue	438	400	858	786
Reportable Legal Entities | Mobility | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	81	77	158	151
Reportable Legal Entities | Mobility | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	357	323	700	635
Reportable Legal Entities | Mobility | Subscription
Disaggregation of Revenue [Line Items]
Revenue	357	323		635
Reportable Legal Entities | Mobility | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	81	77		151
Reportable Legal Entities | Mobility | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Mobility | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Mobility | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Mobility | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Indices
Disaggregation of Revenue [Line Items]
Revenue	446	389	891	776
Reportable Legal Entities | Indices | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Indices | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	446	389	891	776
Reportable Legal Entities | Indices | Subscription
Disaggregation of Revenue [Line Items]
Revenue	80	74		144
Reportable Legal Entities | Indices | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Indices | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Reportable Legal Entities | Indices | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	286	245		489
Reportable Legal Entities | Indices | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	80	70		143
Reportable Legal Entities | Indices | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0		0
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenue	(49)	(46)	(97)	(91)
Intersegment Elimination | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	(49)	(46)	(97)	(91)
Intersegment Elimination | Subscription
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	(49)	(46)	(97)	(91)
Intersegment Elimination | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Market Intelligence
Disaggregation of Revenue [Line Items]
Revenue	(3)	(3)	(6)	(6)
Intersegment Elimination | Ratings
Disaggregation of Revenue [Line Items]
Revenue	(43)	(40)	(85)	(80)
Intersegment Elimination | Indices
Disaggregation of Revenue [Line Items]
Revenue	$ (3)	$ (3)	$ (6)	$ (5)