Segment and Related Information - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 3,777	$ 3,491
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	850	794
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	2,927	2,697
Subscription
Disaggregation of Revenue [Line Items]
Revenue	1,898	1,778
Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	850	794
Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	481	435
Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	288	244
Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	110	99
Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	150	141
Reportable Legal Entities
Disaggregation of Revenue [Line Items]
Revenue	3,825	3,536
Reportable Legal Entities | Market Intelligence
Disaggregation of Revenue [Line Items]
Revenue	1,199	1,142
Reportable Legal Entities | Market Intelligence | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	56	54
Reportable Legal Entities | Market Intelligence | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,143	1,088
Reportable Legal Entities | Market Intelligence | Subscription
Disaggregation of Revenue [Line Items]
Revenue	993	947
Reportable Legal Entities | Market Intelligence | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	56	54
Reportable Legal Entities | Market Intelligence | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Market Intelligence | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Market Intelligence | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Market Intelligence | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	150	141
Reportable Legal Entities | Ratings
Disaggregation of Revenue [Line Items]
Revenue	1,149	1,062
Reportable Legal Entities | Ratings | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	620	582
Reportable Legal Entities | Ratings | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	529	480
Reportable Legal Entities | Ratings | Subscription
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Ratings | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	620	582
Reportable Legal Entities | Ratings | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	529	480
Reportable Legal Entities | Ratings | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Ratings | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Ratings | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Commodity Insights Segment
Disaggregation of Revenue [Line Items]
Revenue	612	559
Reportable Legal Entities | Commodity Insights Segment | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	97	83
Reportable Legal Entities | Commodity Insights Segment | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	515	476
Reportable Legal Entities | Commodity Insights Segment | Subscription
Disaggregation of Revenue [Line Items]
Revenue	486	450
Reportable Legal Entities | Commodity Insights Segment | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	97	83
Reportable Legal Entities | Commodity Insights Segment | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Commodity Insights Segment | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Commodity Insights Segment | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	29	26
Reportable Legal Entities | Commodity Insights Segment | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Mobility Segment
Disaggregation of Revenue [Line Items]
Revenue	420	386
Reportable Legal Entities | Mobility Segment | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	77	75
Reportable Legal Entities | Mobility Segment | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	343	311
Reportable Legal Entities | Mobility Segment | Subscription
Disaggregation of Revenue [Line Items]
Revenue	343	311
Reportable Legal Entities | Mobility Segment | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	77	75
Reportable Legal Entities | Mobility Segment | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Mobility Segment | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Mobility Segment | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Mobility Segment | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Indices
Disaggregation of Revenue [Line Items]
Revenue	445	387
Reportable Legal Entities | Indices | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Indices | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	445	387
Reportable Legal Entities | Indices | Subscription
Disaggregation of Revenue [Line Items]
Revenue	76	70
Reportable Legal Entities | Indices | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Indices | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0
Reportable Legal Entities | Indices | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	288	244
Reportable Legal Entities | Indices | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	81	73
Reportable Legal Entities | Indices | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenue	(48)	(45)
Intersegment Elimination | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	(48)	(45)
Intersegment Elimination | Subscription
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination | Non-transaction
Disaggregation of Revenue [Line Items]
Revenue	(48)	(45)
Intersegment Elimination | Asset-linked fees
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination | Recurring variable revenue
Disaggregation of Revenue [Line Items]
Revenue	0	0
Intersegment Elimination | Market Intelligence
Disaggregation of Revenue [Line Items]
Revenue	(3)	(3)
Intersegment Elimination | Ratings
Disaggregation of Revenue [Line Items]
Revenue	(42)	(40)
Intersegment Elimination | Indices
Disaggregation of Revenue [Line Items]
Revenue	$ (3)	$ (2)