Segment and Related Information - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 3,888	$ 3,575	$ 11,420	$ 10,616
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	812	735	2,406	2,305
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	3,076	2,840	9,014	8,311
Subscription
Disaggregation of Revenue [Line Items]
Revenue	1,986	1,864	5,837	5,464
Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	812	735	2,406	2,305
Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	521	466	1,505	1,365
Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	303	266	876	756
Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	108	102	329	296
Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	158	142	467	430
Reportable Legal Entities
Disaggregation of Revenue [Line Items]
Revenue	3,939	3,622	11,567	10,754
Reportable Legal Entities | Market Intelligence
Disaggregation of Revenue [Line Items]
Revenue	1,236	1,162	3,653	3,459
Reportable Legal Entities | Market Intelligence | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	43	39	141	136
Reportable Legal Entities | Market Intelligence | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,193	1,123	3,512	3,323
Reportable Legal Entities | Market Intelligence | Subscription
Disaggregation of Revenue [Line Items]
Revenue	1,035	981	3,045	2,893
Reportable Legal Entities | Market Intelligence | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	43	39	141	136
Reportable Legal Entities | Market Intelligence | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Market Intelligence | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Market Intelligence | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Market Intelligence | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	158	142	467	430
Reportable Legal Entities | Ratings
Disaggregation of Revenue [Line Items]
Revenue	1,240	1,110	3,537	3,307
Reportable Legal Entities | Ratings | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	668	597	1,885	1,804
Reportable Legal Entities | Ratings | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	572	513	1,652	1,503
Reportable Legal Entities | Ratings | Subscription
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Ratings | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	668	597	1,885	1,804
Reportable Legal Entities | Ratings | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	572	513	1,652	1,503
Reportable Legal Entities | Ratings | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Ratings | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Ratings | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Commodity Insights
Disaggregation of Revenue [Line Items]
Revenue	556	522	1,722	1,597
Reportable Legal Entities | Commodity Insights | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	18	18	139	133
Reportable Legal Entities | Commodity Insights | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	538	504	1,583	1,464
Reportable Legal Entities | Commodity Insights | Subscription
Disaggregation of Revenue [Line Items]
Revenue	507	478	1,493	1,387
Reportable Legal Entities | Commodity Insights | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	18	18	139	133
Reportable Legal Entities | Commodity Insights | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Commodity Insights | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Commodity Insights | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	31	26	90	77
Reportable Legal Entities | Commodity Insights | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Mobility
Disaggregation of Revenue [Line Items]
Revenue	445	412	1,303	1,198
Reportable Legal Entities | Mobility | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	83	81	241	232
Reportable Legal Entities | Mobility | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	362	331	1,062	966
Reportable Legal Entities | Mobility | Subscription
Disaggregation of Revenue [Line Items]
Revenue	362	331	1,062	966
Reportable Legal Entities | Mobility | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	83	81	241	232
Reportable Legal Entities | Mobility | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Mobility | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Mobility | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Mobility | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Indices
Disaggregation of Revenue [Line Items]
Revenue	462	416	1,352	1,193
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	462	416	1,352	1,193
Reportable Legal Entities | Indices | Subscription
Disaggregation of Revenue [Line Items]
Revenue	82	74	237	218
Reportable Legal Entities | Indices | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Indices | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Reportable Legal Entities | Indices | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	303	266	876	756
Reportable Legal Entities | Indices | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	77	76	239	219
Reportable Legal Entities | Indices | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenue	(51)	(47)	(147)	(138)
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	(51)	(47)	(147)	(138)
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	(51)	(47)	(147)	(138)
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	(4)	(3)	(10)	(9)
Intersegment Elimination | Ratings
Disaggregation of Revenue [Line Items]
Revenue	(44)	(41)	(129)	(121)
Intersegment Elimination | Commodity Insights
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Indices
Disaggregation of Revenue [Line Items]
Revenue	$ (3)	$ (3)	$ (8)	$ (8)