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OPERATING REVENUE - Assets and liabilities arising from contracts with customers (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Contract balances    
Receivables (billed) $ 537 $ 468
Receivables (unbilled) 46 40
Contract liabilities (137) (157)
Capitalized costs    
Customer acquisition costs $ 87 $ 98