Revenues (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,032	$ 3,501
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	224
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	163
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78	57
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,441	3,945
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	208	135
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,437	1,677
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,559	1,787
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36	37
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,649	4,080
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,169	2,263
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	173	224
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	163
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19	9
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,519	2,659
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	166	104
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	859	875
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,276	1,352
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34	36
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,685	2,763
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	842	1,212
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	59	48
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	901	1,260
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	40	28
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	568	789
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	274	423
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	941	1,288
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	21	26
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	21	26
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	2	3
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10	13
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	12
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2	1
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 23	$ 29

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