Revenues (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,257	$ 3,032
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	206	173
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	172	158
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	68	78
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,703	3,441
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	203	208
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,557	1,437
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,663	1,559
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37	36
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,906	3,649
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,292	2,169
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	206	173
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	172	158
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	19
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,687	2,519
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	148	166
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	924	859
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,333	1,276
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	35	34
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,835	2,685
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	952	842
Regulated Natural Gas \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Regulated Natural Gas \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Regulated Natural Gas \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	51	59
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,003	901
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	52	40
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	632	568
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	320	274
Regulated Natural Gas \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Regulated Natural Gas \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	1,055	941
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13	21
All Other \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
All Other \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
All Other \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
All Other \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13	21
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	3	2
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	10
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10	9
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	2
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 16	$ 23

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