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BUSINESS SEGMENTS - Revenues Excluding Cost Reimbursements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Disclosure [Line Items]      
Revenues excluding cost reimbursement $ 3,278 $ 3,166 $ 3,289
United States      
Segment Reporting Disclosure [Line Items]      
Revenues excluding cost reimbursement 2,797 2,722 2,886
All other countries      
Segment Reporting Disclosure [Line Items]      
Revenues excluding cost reimbursement $ 481 $ 444 $ 403