Revenue from Contracts with Customers - PAC (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,672	$ 6,366
Regulated \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,968	2,824
Regulated \| Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	223	146
Regulated \| Regulated transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	516	606
Regulated \| Other customer revenue
Disaggregation of Revenue [Line Items]
Total Customer Revenue	46	27
PAC
Disaggregation of Revenue [Line Items]
Other revenue	24	33
Operating revenue	1,808	1,768
PAC \| Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,784	1,735
PAC \| Regulated \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1,686	1,647
PAC \| Regulated \| Wholesale
Disaggregation of Revenue [Line Items]
Total Customer Revenue	21	13
PAC \| Regulated \| Regulated transmission and distribution
Disaggregation of Revenue [Line Items]
Total Customer Revenue	35	48
PAC \| Regulated \| Other customer revenue
Disaggregation of Revenue [Line Items]
Total Customer Revenue	42	27
PAC \| Regulated \| Residential \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	667	672
PAC \| Regulated \| Commercial \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	597	564
PAC \| Regulated \| Industrial \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	347	344
PAC \| Regulated \| Other retail \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 75	$ 67

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