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DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION - Summarized Income Statement Data (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]                
Operating revenues $ 314     $ 248     $ 926 $ 732
Net Income 118 $ 111 $ 111 91 $ 100 $ 100 340 291
Equity method investment, non-consolidated investees                
Schedule of Equity Method Investments [Line Items]                
Operating revenues 202     201     612 613
Operating expenses 97     95     295 283
Net Income $ 78     $ 86     $ 234 $ 280