Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 12,641	$ 13,591	$ 14,708
Total revenue from contracts with customers | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	10,471	10,940	11,623
Total revenue from contracts with customers | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	2,120	2,549	2,990
Total revenue from contracts with customers | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	50	102	95
Retail
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11,109	11,908	12,404
Retail | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	4,862	5,179	5,409
Retail | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,096	6,566	6,837
Retail | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	151	163	158
Retail | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9,114	9,413	9,497
Retail | Regulated Electric | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	3,552	3,560	3,542
Retail | Regulated Electric | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	5,420	5,703	5,807
Retail | Regulated Electric | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	142	150	148
Retail | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,945	2,393	2,812
Retail | Natural Gas | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	1,299	1,560	1,814
Retail | Natural Gas | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	646	833	998
Retail | Natural Gas | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Retail | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	50	102	95
Retail | All Other | Residential
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	11	59	53
Retail | All Other | C&I
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	30	30	32
Retail | All Other | Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	9	13	10
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	645	815	1,354
Wholesale | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	645	815	1,354
Wholesale | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Wholesale | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Transmission
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	648	649	675
Transmission | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	648	649	675
Transmission | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Transmission | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	239	219	275
Other | Regulated Electric
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	64	63	97
Other | Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	175	156	178
Other | All Other
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	0	0	0
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	800	615	602
Alternative revenue and other | Regulated Electric
Disaggregation of Revenue [Line Items]
Alternative revenue and other	676	506	500
Alternative revenue and other | Natural Gas
Disaggregation of Revenue [Line Items]
Alternative revenue and other	110	96	90
Alternative revenue and other | All Other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	14	13	12
Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Total revenues	13,441	14,206	15,310
Operating Segments [Member] | Regulated Electric
Disaggregation of Revenue [Line Items]
Total revenues	11,147	11,446	12,123
Operating Segments [Member] | Natural Gas
Disaggregation of Revenue [Line Items]
Total revenues	2,230	2,645	3,080
Operating Segments [Member] | All Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 64	$ 115	$ 107