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Description of the Business and Basis of Presentation (Summarized Income Statement Data) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 220	$ 215
Net Income	84	84
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	211	198
Operating expenses	94	94
Net Income	$ 110	$ 95

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