Goodwill and Identifiable Intangible Assets and Liabilities - Schedule of Amortization Expense Related to Intangible Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets and liabilities	$ 573	$ 521	$ 604
Depreciation and amortization
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets and liabilities	$ 173	158	208
Retail customer relationship | Depreciation and amortization
Finite-Lived Intangible Assets [Line Items]
Remaining useful lives of identifiable intangible assets at December 31, 2024 (weighted average in years)	2 years
Amortization of intangible assets and liabilities	$ 111	98	137
Software and other technology-related assets | Depreciation and amortization
Finite-Lived Intangible Assets [Line Items]
Remaining useful lives of identifiable intangible assets at December 31, 2024 (weighted average in years)	3 years
Amortization of intangible assets and liabilities	$ 60	58	69
Retail and wholesale contracts | Operating revenues/Fuel, purchased power costs, and delivery fees
Finite-Lived Intangible Assets [Line Items]
Remaining useful lives of identifiable intangible assets at December 31, 2024 (weighted average in years)	3 years
Amortization of intangible assets and liabilities	$ (12)	8	7
Other identifiable intangible assets | Fuel, purchased power costs, and delivery fees/Depreciation and amortization
Finite-Lived Intangible Assets [Line Items]
Remaining useful lives of identifiable intangible assets at December 31, 2024 (weighted average in years)	4 years
Amortization of intangible assets and liabilities	$ 414	$ 357	$ 391