Consolidated Statements of Operations and Comprehensive Income, Parent - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenues
Operating revenues	$ 24,280	$ 18,461	$ 16,392
Operating revenues from affiliates	160	1,188	1,211
Total operating revenues	24,440	19,649	17,603
Operating expenses
Purchased power and fuel	17,457	12,157	9,592
Purchased power and fuel from affiliates	5	6	(7)
Operating and maintenance	4,797	3,934	4,613
Operating and maintenance from affiliates	44	621	555
Depreciation and amortization	1,091	3,003	2,123
Taxes other than income taxes	552	475	482
Total operating expenses	23,946	20,196	17,358
Gain on sales of assets and businesses	1	201	11
Operating income (loss)	495	(346)	256
Other income and (deductions)
Interest expense, net	(250)	(282)	(328)
Interest expense to affiliates	(1)	(15)	(29)
Other, net	(786)	795	937
Total other income and (deductions)	(1,037)	498	580
(Loss) income before income taxes	(542)	152	836
Income taxes	(388)	225	249
Equity in losses of unconsolidated affiliates	(13)	(10)	(8)
Net (loss) income	(167)	(83)	579
Net (loss) income attributable to noncontrolling interests	(7)	122	(10)
Net (loss) income attributable to common shareholders	(160)	(205)	589
Comprehensive income (loss), net of income taxes
Net (loss) income	(167)	(83)	579
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	(6)	0	0
Actuarial loss reclassified to periodic cost	101	0	0
Pension and non-pension postretirement benefit plans valuation adjustment	186	0	0
Unrealized loss on cash flow hedges	(1)	(1)	(2)
Unrealized (loss) gain on foreign currency translation	(3)	0	4
Other comprehensive income (loss), net of income taxes	277	(1)	2
Comprehensive income (loss)	110	(84)	581
Comprehensive (loss) income attributable to noncontrolling interests	(7)	122	(10)
Comprehensive income (loss) attributable to common shareholders	$ 117	$ (206)	$ 591
Average shares of common stock outstanding:
Basic (in shares)	328	0	0
Assumed exercise and/or distributions of stock-based awards (in shares)	1	0	0
Diluted (in shares)	329	0	0
Earnings per average common share
Basic (in dollars per share)	$ (0.49)	$ 0	$ 0
Diluted (in dollars per share)	$ (0.49)	$ 0	$ 0