REVENUE - Receivables from Customers (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	$ 1,382	$ 1,455
Less — Allowance for uncollectible customer receivables	64	137
Receivable	1,318	1,318
Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	717	674
Billed | Financial Asset, Greater than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	288	290
Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	$ 665	$ 781