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Goodwill and Identifiable Intangible Assets and Liabilities - Schedule of Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 2,583	$ 2,583
Texas Generation Reporting Unit
Goodwill [Line Items]
Goodwill	122	122
Retail Reporting Unit
Goodwill [Line Items]
Goodwill	$ 2,461	$ 2,461

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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