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Amount of revenue that is not accounted for under Topic 606.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Revenues (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,693	$ 2,472	$ 5,820	$ 4,859
Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	318	234	577	977
Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	156	148	308	294
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	49	62	117	95
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,216	2,916	6,822	6,225
Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	208	152	353	384
Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,060	1,024	2,548	2,152
C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,587	1,414	3,180	2,642
Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	46	34	92	65
Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	3,424	3,068	7,175	6,609
Regulated Electric \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,250	2,070	4,334	3,866
Regulated Electric \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	318	234	577	977
Regulated Electric \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	156	148	308	294
Regulated Electric \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12	20	35	34
Regulated Electric \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,736	2,472	5,254	5,171
Regulated Electric \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	187	125	302	296
Regulated Electric \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	797	756	1,614	1,489
Regulated Electric \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,416	1,282	2,651	2,315
Regulated Electric \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37	32	69	62
Regulated Electric \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	2,923	2,597	5,556	5,467
Regulated Natural Gas \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	421	383	1,439	954
Regulated Natural Gas \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Regulated Natural Gas \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Regulated Natural Gas \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37	42	82	61
Regulated Natural Gas \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	458	425	1,521	1,015
Regulated Natural Gas \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	18	24	45	81
Regulated Natural Gas \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	257	257	919	642
Regulated Natural Gas \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	164	126	520	312
Regulated Natural Gas \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Regulated Natural Gas \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	476	449	1,566	1,096
All Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	19	47	39
All Other \| Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All Other \| Transmission
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All Other \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
All Other \| Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	19	47	39
All Other \| Alternative revenue and other
Disaggregation of Revenue [Line Items]
Alternative revenue and other	3	3	6	7
All Other \| Residential \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6	11	15	21
All Other \| C&I \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	6	9	15
All Other \| Other \| Retail
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9	2	23	3
All Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 25	$ 22	$ 53	$ 46