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BUSINESS SEGMENTS - Segment Revenues (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]      
Number of reporting segments | segment 2    
Total revenue $ 13,857 $ 10,571 $ 20,972
Total segment      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 12,610 9,502 20,377
Total segment | Non-US      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 2,615 1,910 4,400
Total segment | U.S. & Canada      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 10,356 7,905 16,833
Total segment | International      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 2,254 1,597 3,544
Unallocated corporate and other      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 1,247 1,069 595
Net fee revenues      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Gross fee revenues 2,694 1,683 3,823
Contract investment amortization (75) (132) (62)
Total revenue 2,619 1,551 3,761
Net fee revenues | Total segment      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Gross fee revenues 2,148 1,252 3,297
Contract investment amortization (75) (132) (62)
Total revenue 2,073 1,120 3,235
Net fee revenues | Total segment | U.S. & Canada      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Gross fee revenues 1,580 914 2,265
Contract investment amortization (55) (108) (48)
Total revenue 1,525 806 2,217
Net fee revenues | Total segment | International      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Gross fee revenues 568 338 1,032
Contract investment amortization (20) (24) (14)
Total revenue 548 314 1,018
Owned, leased, and other      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 796 568 1,612
Owned, leased, and other | Total segment      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 749 515 1,556
Owned, leased, and other | Total segment | U.S. & Canada      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 282 198 715
Owned, leased, and other | Total segment | International      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 467 317 841
Reimbursements      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue [1] 10,442 8,452 15,599
Reimbursements | Total segment      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 9,788 7,867 15,586
Reimbursements | Total segment | Non-US      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 1,553 1,247 2,394
Reimbursements | Total segment | U.S. & Canada      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 8,549 6,901 13,901
Reimbursements | Total segment | International      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue $ 1,239 $ 966 $ 1,685
[1] See Note 15 for disclosure of related party amounts.