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BUSINESS SEGMENTS - Segment Profits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits $ 1,750 $ 84 $ 1,800
Interest expense, net of interest income (392) (418) (368)
(Provision) benefit for income taxes (81) 199 (326)
NET INCOME (LOSS) 1,099 (267) 1,273
Non-US | Reimbursements      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits 14 (62) (18)
Total segment | Non-US      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits 297 (198) 982
Total segment | U.S. & Canada      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits 1,394 198 2,000
Total segment | U.S. & Canada | Reimbursements      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits 51 (80) (129)
Total segment | International      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits 258 (222) 804
Total segment | International | Reimbursements      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits 14 (55) (18)
Unallocated corporate and other      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total segments profits $ (80) $ (24) $ (837)