Segment and Related Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total assets	$ 59,749	$ 60,221
Operating Segments
Segment Reporting Information [Line Items]
Total assets	54,929	55,592
Operating Segments | Market Intelligence
Segment Reporting Information [Line Items]
Total assets	28,764,000	29,478
Operating Segments | Ratings
Segment Reporting Information [Line Items]
Total assets	1,180	1,056
Operating Segments | Commodity Insights
Segment Reporting Information [Line Items]
Total assets	3,335	8,636
Operating Segments | Mobility
Segment Reporting Information [Line Items]
Total assets	8,667	13,222
Operating Segments | Indices
Segment Reporting Information [Line Items]
Total assets	12,983	3,200
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 4,820	$ 4,629