Consolidated Statements of Operations - NPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 25,602	$ 26,337	$ 25,150
Operating expenses:
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
Other income (expense):
Interest expense	(2,415)	(2,216)	(2,118)
Capitalized interest	132	76	64
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
NPC
Revenues	3,088	2,630	2,139
Operating expenses:
Cost of fuel and energy	1,942	1,427	939
Operations and maintenance	312	303	301
Depreciation and amortization	432	417	406
Property and other taxes	56	53	48
Total operating expenses	2,742	2,200	1,694
Operating income	346	430	445
Other income (expense):
Interest expense	(196)	(165)	(153)
Capitalized interest	25	8	3
Allowance for equity funds	21	11	7
Interest and dividend income	72	47	20
Other, net	14	3	18
Total other income (expense)	(64)	(96)	(105)
Income before income tax expense (benefit) and equity income (loss)	282	334	340
Income tax expense (benefit)	22	36	37
Net income attributable to parent	$ 260	$ 298	$ 303