v3.26.1
REVENUES - Transaction and Relationship Revenue (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Revenue $ 2,185 $ 1,898 $ 4,264 $ 3,822
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
Transaction Revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 901 $ 699 $ 1,708 $ 1,468
Percentage of revenues 41.00% 37.00% 40.00% 38.00%
Recurring Revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 1,284 $ 1,199 $ 2,556 $ 2,354
Percentage of revenues 59.00% 63.00% 60.00% 62.00%
MA        
Disaggregation of Revenue [Line Items]        
Revenue $ 925 $ 888 $ 1,851 $ 1,747
MA | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 928 $ 891 $ 1,857 $ 1,753
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | DS Banking Product and Service | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 119 $ 138 $ 252 $ 279
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | Insurance | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 183 $ 168 $ 364 $ 331
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | KYC | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 121 $ 107 $ 239 $ 208
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | Decision Solutions (DS) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 423 $ 413 $ 855 $ 818
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | Research and Insights (R&I) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 256 $ 249 $ 511 $ 485
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | Data and Information (D&I) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 246 $ 226 $ 485 $ 444
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MA | Transaction Revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 10 $ 36 $ 27 $ 73
MA | Transaction Revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Percentage of revenues 1.00% 4.00% 1.00% 4.00%
MA | Transaction Revenue | DS Banking Product and Service | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 3 $ 25 $ 9 $ 51
Percentage of revenues 3.00% 18.00% 4.00% 18.00%
MA | Transaction Revenue | Insurance | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 3 $ 6 $ 7 $ 12
Percentage of revenues 2.00% 4.00% 2.00% 4.00%
MA | Transaction Revenue | KYC | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 1 $ 0 $ 1 $ 0
Percentage of revenues 1.00% 0.00% 0.00% 0.00%
MA | Transaction Revenue | Decision Solutions (DS) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 7 $ 31 $ 17 $ 63
Percentage of revenues 2.00% 8.00% 2.00% 8.00%
MA | Transaction Revenue | Research and Insights (R&I) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 2 $ 3 $ 5 $ 6
Percentage of revenues 1.00% 1.00% 1.00% 1.00%
MA | Transaction Revenue | Data and Information (D&I) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 1 $ 2 $ 5 $ 4
Percentage of revenues 0.00% 1.00% 1.00% 1.00%
MA | Recurring Revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 915 $ 852 $ 1,824 $ 1,674
MA | Recurring Revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Percentage of revenues 99.00% 96.00% 99.00% 96.00%
MA | Recurring Revenue | DS Banking Product and Service | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 116 $ 113 $ 243 $ 228
Percentage of revenues 97.00% 82.00% 96.00% 82.00%
MA | Recurring Revenue | Insurance | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 180 $ 162 $ 357 $ 319
Percentage of revenues 98.00% 96.00% 98.00% 96.00%
MA | Recurring Revenue | KYC | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 120 $ 107 $ 238 $ 208
Percentage of revenues 99.00% 100.00% 100.00% 100.00%
MA | Recurring Revenue | Decision Solutions (DS) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 416 $ 382 $ 838 $ 755
Percentage of revenues 98.00% 92.00% 98.00% 92.00%
MA | Recurring Revenue | Research and Insights (R&I) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 254 $ 246 $ 506 $ 479
Percentage of revenues 99.00% 99.00% 99.00% 99.00%
MA | Recurring Revenue | Data and Information (D&I) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 245 $ 224 $ 480 $ 440
Percentage of revenues 100.00% 99.00% 99.00% 99.00%
MIS        
Disaggregation of Revenue [Line Items]        
Revenue $ 1,260 $ 1,010 $ 2,413 $ 2,075
MIS | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 1,312 $ 1,060 $ 2,516 $ 2,174
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MIS | Corporate Finance (CFG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 651 $ 512 $ 1,284 $ 1,076
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MIS | Structured Finance (SFG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 151 $ 135 $ 288 $ 273
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MIS | Financial Institutions (FIG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 222 $ 191 $ 416 $ 382
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 224 $ 162 $ 400 $ 325
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MIS | MIS Other        
Disaggregation of Revenue [Line Items]        
Revenue $ 12 $ 10    
MIS | MIS Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 12 $ 10 $ 25 $ 19
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
MIS | Transaction Revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 891 $ 663 $ 1,681 $ 1,395
MIS | Transaction Revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Percentage of revenues 71.00% 66.00% 70.00% 67.00%
MIS | Transaction Revenue | Corporate Finance (CFG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 494 $ 365 $ 978 $ 792
Percentage of revenues 76.00% 71.00% 76.00% 74.00%
MIS | Transaction Revenue | Structured Finance (SFG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 88 $ 74 $ 162 $ 152
Percentage of revenues 58.00% 55.00% 56.00% 56.00%
MIS | Transaction Revenue | Financial Institutions (FIG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 135 $ 108 $ 240 $ 217
Percentage of revenues 61.00% 57.00% 58.00% 57.00%
MIS | Transaction Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 172 $ 113 $ 296 $ 229
Percentage of revenues 77.00% 70.00% 74.00% 70.00%
MIS | Transaction Revenue | MIS Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 2 $ 3 $ 5 $ 5
Percentage of revenues 17.00% 30.00% 20.00% 26.00%
MIS | Recurring Revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 369 $ 347 $ 732 $ 680
MIS | Recurring Revenue | Operating Segments        
Disaggregation of Revenue [Line Items]        
Percentage of revenues 29.00% 34.00% 30.00% 33.00%
MIS | Recurring Revenue | Corporate Finance (CFG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 157 $ 147 $ 306 $ 284
Percentage of revenues 24.00% 29.00% 24.00% 26.00%
MIS | Recurring Revenue | Structured Finance (SFG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 63 $ 61 $ 126 $ 121
Percentage of revenues 42.00% 45.00% 44.00% 44.00%
MIS | Recurring Revenue | Financial Institutions (FIG) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 87 $ 83 $ 176 $ 165
Percentage of revenues 39.00% 43.00% 42.00% 43.00%
MIS | Recurring Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 52 $ 49 $ 104 $ 96
Percentage of revenues 23.00% 30.00% 26.00% 30.00%
MIS | Recurring Revenue | MIS Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenue $ 10 $ 7 $ 20 $ 14
Percentage of revenues 83.00% 70.00% 80.00% 74.00%