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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Summarized Income Statement Data (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Schedule of Equity Method Investments [Line Items]            
Operating revenues $ 244   $ 224   $ 484 $ 444
Net Income 100 $ 100 94 $ 84 200 178
Equity method investment, non-consolidated investees            
Schedule of Equity Method Investments [Line Items]            
Operating revenues 198   199   412 410
Operating expenses 94   94   188 188
Net Income $ 91   $ 91   $ 194 $ 201