Revenues (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,501	$ 3,128
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	224	259
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	163	152
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	68
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,945	3,607
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	135	144
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,677	1,489
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,787	1,593
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37	46
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	4,080	3,751
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,263	2,084
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	224	259
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	163	152
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	23
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,659	2,518
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	104	115
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	875	817
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,352	1,235
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36	32
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,763	2,633
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,212	1,019
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	48	45
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,260	1,064
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	28	26
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	789	663
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	423	356
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	1,288	1,090
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26	25
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	26	25
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	3	3
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13	9
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12	2
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	14
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 29	$ 28

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