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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.

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