Consolidated Statements of Operations - NPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 25,150	$ 20,952	$ 19,844
Operating expenses:
Cost of fuel and energy	5,504	4,187	4,586
Total operating expenses	19,823	16,661	15,694
Operating income	5,327	4,291	4,150
Other income (expense):
Interest expense	(2,118)	(2,021)	(1,912)
Allowance for borrowed funds	64	80	77
Allowance for equity funds	126	165	173
Interest and dividend income	89	71	117
Other, net	(17)	88	97
Total other income (expense)	(33)	3,180	(1,736)
Income (loss) before income tax expense (benefit) and equity income (loss)	5,294	7,471	2,414
Income tax (benefit) expense	(1,132)	308	(598)
Net income (loss) attributable to parent	5,790	6,943	2,950
NPC
Revenues	2,139	1,998	2,148
Operating expenses:
Cost of fuel and energy	939	816	943
Operations and maintenance	301	299	324
Depreciation and amortization	406	361	357
Property and other taxes	48	47	45
Total operating expenses	1,694	1,523	1,669
Operating income	445	475	479
Other income (expense):
Interest expense	(153)	(162)	(171)
Allowance for borrowed funds	3	3	3
Allowance for equity funds	7	7	5
Interest and dividend income	20	10	13
Other, net	18	9	8
Total other income (expense)	(105)	(133)	(142)
Income (loss) before income tax expense (benefit) and equity income (loss)	340	342	337
Income tax (benefit) expense	37	47	73
Net income (loss) attributable to parent	$ 303	$ 295	$ 264