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REVENUE - Receivables from Customers (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customers $ 1,557 $ 1,382
Less: Uncollectible Reserve 54 64
Total Customer Receivables 1,503 1,318
Billed    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customers 816 717
Unbilled    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customers $ 741 $ 665