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BUSINESS SEGMENTS - Segment Revenues (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
segment
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of reporting segments | segment   2    
Total revenue   $ 23,713 $ 20,773 $ 13,857
Total segment        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   22,151 19,239 12,610
Total segment | Non-US        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   5,160 4,032 2,615
Total segment | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   17,696 15,753 10,356
Total segment | International        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   4,455 3,486 2,254
Unallocated corporate and other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   1,562 1,534 1,247
Net fee revenues        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues   4,824 4,078 2,694
Contract investment amortization   (88) (89) (75)
Total revenue   4,736 3,989 2,619
Net fee revenues | Total segment        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues   4,089 3,403 2,148
Contract investment amortization   (87) (89) (75)
Total revenue   4,002 3,314 2,073
Net fee revenues | Total segment | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues   2,799 2,486 1,580
Contract investment amortization   (65) (60) (55)
Total revenue   2,734 2,426 1,525
Net fee revenues | Total segment | International        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Gross fee revenues   1,290 917 568
Contract investment amortization   (22) (29) (20)
Total revenue   1,268 888 548
Owned, leased, and other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   1,564 1,367 796
Owned, leased, and other | Total segment        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   1,443 1,280 749
Owned, leased, and other | Total segment | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   506 479 282
Owned, leased, and other | Total segment | International        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   937 801 467
Reimbursements expenses        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue [1]   17,413 15,417 10,442
Reimbursements expenses | Total segment        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   16,706 14,645 9,788
Reimbursements expenses | Total segment | Non-US        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   2,806 2,231 1,553
Reimbursements expenses | Total segment | U.S. & Canada        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   14,456 12,848 8,549
Reimbursements expenses | Total segment | International        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Total revenue   $ 2,250 $ 1,797 $ 1,239
Subsequent Event | Forecast        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Number of reporting segments | segment 4      
[1] See Note 15 for disclosure of related party amounts.