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BUSINESS SEGMENTS - Summary of Segment Revenue, Segment Expenses, and Segment Profits (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Segment Reporting [Abstract]        
Number of reporting segments | segment     4  
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue $ 6,489 $ 6,255 $ 19,496 $ 18,671
Depreciation, amortization, and other 50 45 154 137
General, administrative, and other 234 276 724 785
OPERATING INCOME 1,180 944 3,364 3,015
Total reportable segment revenue        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 5,743 5,603 17,379 16,752
Total reportable segment revenue | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 4,741 4,596 14,401 13,851
Depreciation, amortization, and other 23 21 77 63
General, administrative, and other 40 59 120 145
Other segment items (primarily non-operating income and expenses) (1) (3) (4) (5)
OPERATING INCOME 680 617 2,110 2,029
Total reportable segment revenue | EMEA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 613 635 1,782 1,775
Depreciation, amortization, and other 9 9 28 28
General, administrative, and other 32 25 99 80
Other segment items (primarily non-operating income and expenses) (2) 0 (2) (3)
OPERATING INCOME 158 152 389 386
Total reportable segment revenue | Greater China        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 142 142 430 430
Depreciation, amortization, and other 5 2 10 7
General, administrative, and other 15 14 46 41
Other segment items (primarily non-operating income and expenses) (1) 1 (2) 0
OPERATING INCOME 44 46 142 144
Total reportable segment revenue | APEC        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 247 230 766 696
Depreciation, amortization, and other 2 2 6 6
General, administrative, and other 19 15 53 47
Other segment items (primarily non-operating income and expenses) 0 0 1 (2)
OPERATING INCOME 63 66 219 200
Net fee revenues        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues 1,338 1,283 4,013 3,836
Contract investment amortization (29) (26) (86) (76)
Revenue 1,309 1,257 3,927 3,760
Net fee revenues | Total reportable segment revenue | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues 740 747 2,249 2,227
Contract investment amortization (19) (19) (60) (57)
Revenue 721 728 2,189 2,170
Net fee revenues | Total reportable segment revenue | EMEA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues 172 153 458 425
Contract investment amortization (5) (3) (13) (10)
Revenue 167 150 445 415
Net fee revenues | Total reportable segment revenue | Greater China        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues 64 62 188 186
Contract investment amortization (1) 0 (1) 0
Revenue 63 62 187 186
Net fee revenues | Total reportable segment revenue | APEC        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues 86 82 267 243
Contract investment amortization (1) (2) (4) (4)
Revenue 85 80 263 239
Owned, leased, and other revenue        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 420 381 1,222 1,133
Operating costs 326 300 950 882
Owned, leased, and other revenue | Total reportable segment revenue | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 130 95 390 314
Operating costs 96 82 292 240
Owned, leased, and other revenue | Total reportable segment revenue | EMEA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 161 169 439 444
Operating costs 132 132 373 369
Owned, leased, and other revenue | Total reportable segment revenue | Greater China        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 4 5 21 18
Operating costs 5 3 13 10
Owned, leased, and other revenue | Total reportable segment revenue | APEC        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 32 30 110 98
Operating costs 32 27 93 84
Cost reimbursement revenue        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 4,760 4,617 14,347 13,778
Operating costs 4,739 4,681 14,335 13,827
Cost reimbursement revenue | Total reportable segment revenue | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 3,890 3,773 11,822 11,367
Operating costs 3,903 3,820 11,806 11,379
Cost reimbursement revenue | Total reportable segment revenue | EMEA        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 285 316 898 916
Operating costs 284 317 895 915
Cost reimbursement revenue | Total reportable segment revenue | Greater China        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 75 75 222 226
Operating costs 74 76 221 228
Cost reimbursement revenue | Total reportable segment revenue | APEC        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Revenue 130 120 393 359
Operating costs $ 131 $ 120 $ 394 $ 361