Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Operating Revenue	[1]	$ 832	$ 731	$ 1,818	$ 1,506
Operating Expenses:
Fuel used in electric generation	[2]	155	135	359	280
Purchased power	[1],[2]	37	22	59	32
Gas purchased for resale	[2]	49	46	175	125
Other operations and maintenance		128	126	259	248
Other operations and maintenance - affiliated suppliers		39	42	82	83
Impairment of assets and other charges		0	4	0	4
Depreciation and amortization	[2]	142	136	282	272
Other taxes	[1],[2]	77	76	159	154
Total operating expenses		627	587	1,375	1,198
Operating income		205	144	443	308
Other income (expense), net	[3]	3	1	6	2
Interest charges, net of AFUDC of $7, $6, $13 and $10	[1]	70	67	141	134
Income before income tax expense		138	78	308	176
Income tax expense	[2]	31	15	51	33
Net Income and Other Comprehensive Income		107	63	257	143
Comprehensive Income Attributable to Noncontrolling Interest	[3]	6	6	14	12
Comprehensive Income Available to Common Shareholder		$ 101	$ 57	$ 243	$ 131

[1] See Note 12 for amounts attributable to affiliates.

[2] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to DESC’s CODM.

[3] Items designated are other segment items for each reportable segment.