Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Unbilled receivables, current	$ 802	$ 614
Selling, General and Administrative Expenses
Disaggregation of Revenue [Line Items]
Capitalized contract cost, amortization	97	88	$ 83
Operating revenues
Disaggregation of Revenue [Line Items]
Capitalized contract cost, amortization	6	6	$ 6
Costs to Acquire Residential and Business Retail Customers
Disaggregation of Revenue [Line Items]
Capitalized contract cost, net	$ 114	$ 97
Minimum | Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers, payment terms, number of days due from invoice date	15 days
Maximum | Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers, payment terms, number of days due from invoice date	60 days