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Revenues - Transaction and Relationship Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,924	$ 1,786
Percentage of revenues	100.00%	100.00%
Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 769	$ 724
Percentage of revenues	40.00%	41.00%
Recurring Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 1,155	$ 1,062
Percentage of revenues	60.00%	59.00%
MA
Disaggregation of Revenue [Line Items]
Revenue	$ 859	$ 799
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 862	$ 802
Percentage of revenues	100.00%	100.00%
MA | DS Banking Product and Service | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 141	$ 134
Percentage of revenues	100.00%	100.00%
MA | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 163	$ 144
Percentage of revenues	100.00%	100.00%
MA | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 101	$ 87
Percentage of revenues	100.00%	100.00%
MA | Decision Solutions (DS)
Disaggregation of Revenue [Line Items]
Revenue	$ 405	$ 365
MA | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 405	$ 365
Percentage of revenues	100.00%	100.00%
MA | Research and Insights (R&I)
Disaggregation of Revenue [Line Items]
Revenue	$ 236	$ 222
MA | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 236	$ 222
Percentage of revenues	100.00%	100.00%
MA | Data and Information (D&I)
Disaggregation of Revenue [Line Items]
Revenue	$ 218	$ 212
MA | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 218	$ 212
Percentage of revenues	100.00%	100.00%
MA | Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 37	$ 47
MA | Transaction Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	4.00%	6.00%
MA | Transaction Revenue | DS Banking Product and Service | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 26	$ 29
Percentage of revenues	18.00%	22.00%
MA | Transaction Revenue | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 6	$ 10
Percentage of revenues	4.00%	7.00%
MA | Transaction Revenue | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 2
Percentage of revenues	0.00%	2.00%
MA | Transaction Revenue | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 32	$ 41
Percentage of revenues	8.00%	11.00%
MA | Transaction Revenue | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 3	$ 3
Percentage of revenues	1.00%	1.00%
MA | Transaction Revenue | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 2	$ 3
Percentage of revenues	1.00%	1.00%
MA | Recurring Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 822	$ 752
MA | Recurring Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	96.00%	94.00%
MA | Recurring Revenue | DS Banking Product and Service | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 115	$ 105
Percentage of revenues	82.00%	78.00%
MA | Recurring Revenue | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 157	$ 134
Percentage of revenues	96.00%	93.00%
MA | Recurring Revenue | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 101	$ 85
Percentage of revenues	100.00%	98.00%
MA | Recurring Revenue | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 373	$ 324
Percentage of revenues	92.00%	89.00%
MA | Recurring Revenue | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 233	$ 219
Percentage of revenues	99.00%	99.00%
MA | Recurring Revenue | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 216	$ 209
Percentage of revenues	99.00%	99.00%
MIS
Disaggregation of Revenue [Line Items]
Revenue	$ 1,065	$ 987
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,114	$ 1,034
Percentage of revenues	100.00%	100.00%
MIS | Corporate Finance (CFG)
Disaggregation of Revenue [Line Items]
Revenue	$ 564	$ 529
MIS | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 564	$ 529
Percentage of revenues	100.00%	100.00%
MIS | Structured Finance (SFG)
Disaggregation of Revenue [Line Items]
Revenue	$ 138	$ 114
MIS | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 138	$ 114
Percentage of revenues	100.00%	100.00%
MIS | Financial Institutions (FIG)
Disaggregation of Revenue [Line Items]
Revenue	$ 191	$ 195
MIS | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 191	$ 195
Percentage of revenues	100.00%	100.00%
MIS | Public, Project and Infrastructure Finance (PPIF)
Disaggregation of Revenue [Line Items]
Revenue	$ 163	$ 141
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 163	$ 141
Percentage of revenues	100.00%	100.00%
MIS | MIS Other
Disaggregation of Revenue [Line Items]
Revenue	$ 9	$ 8
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 9	$ 8
Percentage of revenues	100.00%	100.00%
MIS | Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 732	$ 677
MIS | Transaction Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	69.00%	69.00%
MIS | Transaction Revenue | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 427	$ 399
Percentage of revenues	76.00%	75.00%
MIS | Transaction Revenue | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 78	$ 59
Percentage of revenues	57.00%	52.00%
MIS | Transaction Revenue | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 109	$ 122
Percentage of revenues	57.00%	63.00%
MIS | Transaction Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 116	$ 96
Percentage of revenues	71.00%	68.00%
MIS | Transaction Revenue | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 2	$ 1
Percentage of revenues	22.00%	12.00%
MIS | Recurring Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 333	$ 310
MIS | Recurring Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	31.00%	31.00%
MIS | Recurring Revenue | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 137	$ 130
Percentage of revenues	24.00%	25.00%
MIS | Recurring Revenue | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 60	$ 55
Percentage of revenues	43.00%	48.00%
MIS | Recurring Revenue | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 82	$ 73
Percentage of revenues	43.00%	37.00%
MIS | Recurring Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 47	$ 45
Percentage of revenues	29.00%	32.00%
MIS | Recurring Revenue | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 7	$ 7
Percentage of revenues	78.00%	88.00%

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