Consolidated Statements of Operations - SPPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Total operating revenue	$ 25,602	$ 26,337	$ 25,150
Cost of fuel and energy	7,057	6,757	5,504
Total operating expenses	22,822	21,096	19,823
Operating income	2,780	5,241	5,327
Interest expense	(2,415)	(2,216)	(2,118)
Allowance for equity funds	267	167	126
Interest and dividend income	412	154	89
Other, net	116	(7)	(17)
Total other income (expense)	(819)	(3,828)	(33)
Income before income tax expense (benefit) and equity income (loss)	1,961	1,413	5,294
Income tax expense (benefit)	(1,699)	(1,916)	(1,132)
Net income attributable to parent	3,020	2,721	5,790
SPPC
Total operating revenue	1,431	1,193	965
Operations and maintenance	204	189	163
Depreciation and amortization	185	149	143
Property and other taxes	25	24	24
Total operating expenses	1,279	1,028	798
Operating income	152	165	167
Interest expense	(66)	(58)	(54)
Allowance for borrowed funds	7	3	2
Allowance for equity funds	14	7	7
Interest and dividend income	22	18	9
Other, net	4	2	11
Total other income (expense)	(19)	(28)	(25)
Income before income tax expense (benefit) and equity income (loss)	133	137	142
Income tax expense (benefit)	16	19	18
Net income attributable to parent	117	118	124
SPPC | Regulated electric
Total operating revenue	1,194	1,025	848
Cost of fuel and energy	689	555	407
SPPC | Regulated natural gas
Total operating revenue	237	168	117
Cost of fuel and energy	$ 176	$ 111	$ 61