Revenue Recognition - Disaggregated Revenues (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 27,748	$ 28,256	$ 31,488
Mark-to-market for economic hedging activities	206	(2,863)	1,248
Contract amortization	(332)	(168)	(86)
Revenues	28,130	28,823	31,543
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	117	52	35
Retail revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	36	74
Retail revenue \| Home
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12,946	12,171	10,761
Retail revenue \| Business
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	14,203	15,296	18,961
Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	27,149	27,467	29,722
Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	500	553	1,250
Derivative revenue	130	176	(8)
Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	177	197	272
Derivative revenue	76	73	33
Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	(3)	144	(83)
Less: Realized and unrealized ASC 815 revenue	265	515	20
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	336	494	421
Contract amortization	(29)	(32)	(39)
Total operating revenue
Disaggregation of Revenue [Line Items]
Revenues	28,130	28,823	31,543
Other derivative revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	26	48	(32)
Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(39)	(14)	(15)
Revenues	(48)	(30)	17
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	(1)	0	1
Corporate/Eliminations \| Retail revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	110
Corporate/Eliminations \| Retail revenue \| Home
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(25)	(1)	(1)
Corporate/Eliminations \| Retail revenue \| Business
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Corporate/Eliminations \| Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(25)	(1)	(1)
Corporate/Eliminations \| Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(12)	0	32
Derivative revenue	(12)	1	31
Corporate/Eliminations \| Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(3)	(2)	0
Derivative revenue	0	0	0
Corporate/Eliminations \| Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	4	(16)	1
Less: Realized and unrealized ASC 815 revenue	(8)	(16)	31
Corporate/Eliminations \| Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(12)	(11)	(15)
Contract amortization	0	0	0
Corporate/Eliminations \| Total operating revenue
Disaggregation of Revenue [Line Items]
Revenues	(48)	(30)	17
Corporate/Eliminations \| Other derivative revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	(1)	(1)
Texas \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,623	10,447	10,059
Revenues	10,653	10,476	10,057
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	0	0	0
Texas \| Operating Segments \| Retail revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	0
Texas \| Operating Segments \| Retail revenue \| Home
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,836	6,538	6,388
Texas \| Operating Segments \| Retail revenue \| Business
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,564	3,492	3,229
Texas \| Operating Segments \| Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,400	10,030	9,617
Texas \| Operating Segments \| Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	41	77	111
Derivative revenue	0	0	0
Texas \| Operating Segments \| Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0	0
Derivative revenue	0	0	0
Texas \| Operating Segments \| Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0	0	2
Less: Realized and unrealized ASC 815 revenue	30	29	(2)
Texas \| Operating Segments \| Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	212	369	327
Contract amortization	0	0	0
Texas \| Operating Segments \| Total operating revenue
Disaggregation of Revenue [Line Items]
Revenues	10,653	10,476	10,057
Texas \| Operating Segments \| Other derivative revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	30	29	(4)
Texas \| Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(22)	(5)	(4)
East \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,482	12,166	16,686
Revenues	11,707	12,547	16,763
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	57	17	(7)
East \| Operating Segments \| Retail revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	36	74	110
East \| Operating Segments \| Retail revenue \| Home
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,453	2,195	2,088
East \| Operating Segments \| Retail revenue \| Business
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8,794	9,751	13,768
East \| Operating Segments \| Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,247	11,946	15,856
East \| Operating Segments \| Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	242	291	641
Derivative revenue	79	162	(31)
East \| Operating Segments \| Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	156	197	232
Derivative revenue	76	73	33
East \| Operating Segments \| Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	(23)	57	(30)
Less: Realized and unrealized ASC 815 revenue	168	364	84
East \| Operating Segments \| Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	112	88	104
Contract amortization	(27)	(32)	(40)
East \| Operating Segments \| Total operating revenue
Disaggregation of Revenue [Line Items]
Revenues	11,707	12,547	16,763
East \| Operating Segments \| Other derivative revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	(2)	2
East \| Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	(9)	26
West/Services/Other \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,750	4,108	4,758
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	61	35	41
West/Services/Other \| Operating Segments \| Retail revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	0
West/Services/Other \| Operating Segments \| Retail revenue \| Home
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,750	1,890	2,286
West/Services/Other \| Operating Segments \| Retail revenue \| Business
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,845	2,053	1,964
West/Services/Other \| Operating Segments \| Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,595	3,943	4,250
West/Services/Other \| Operating Segments \| Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	229	185	466
Derivative revenue	63	13	(8)
West/Services/Other \| Operating Segments \| Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	24	2	40
Derivative revenue	0	0	0
West/Services/Other \| Operating Segments \| Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	16	103	(56)
Less: Realized and unrealized ASC 815 revenue	75	138	(93)
West/Services/Other \| Operating Segments \| Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	24	48	5
Contract amortization	(2)	0	1
West/Services/Other \| Operating Segments \| Total operating revenue
Disaggregation of Revenue [Line Items]
Revenues	3,886	4,281	4,706
West/Services/Other \| Operating Segments \| Other derivative revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	(4)	22	(29)
Vivint Smart Home \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,932	1,549
Revenues	1,932	1,549
Less: Revenues accounted for under topics other than ASC 606 and ASC 815	0	0
Vivint Smart Home \| Operating Segments \| Retail revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0	$ 0
Vivint Smart Home \| Operating Segments \| Retail revenue \| Home
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,932	1,549
Vivint Smart Home \| Operating Segments \| Retail revenue \| Business
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Vivint Smart Home \| Operating Segments \| Total retail revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,932	1,549
Vivint Smart Home \| Operating Segments \| Energy revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Derivative revenue	0	0
Vivint Smart Home \| Operating Segments \| Capacity revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Derivative revenue	0	0
Vivint Smart Home \| Operating Segments \| Derivative revenue
Disaggregation of Revenue [Line Items]
Mark-to-market for economic hedging activities	0	0
Less: Realized and unrealized ASC 815 revenue	0	0
Vivint Smart Home \| Operating Segments \| Other revenue
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0	0
Contract amortization	0	0
Vivint Smart Home \| Operating Segments \| Total operating revenue
Disaggregation of Revenue [Line Items]
Revenues	1,932	1,549
Vivint Smart Home \| Operating Segments \| Other derivative revenue
Disaggregation of Revenue [Line Items]
Derivative revenue	0	0
Vivint Smart Home \| Corporate/Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ (8)	$ 0

Unrealized Gain (Loss) on Derivatives, Mark To Market, Economic Hedging Activities

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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