STATEMENTS OF CONSOLIDATED INCOME - USD ($) shares in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Utility revenues			$ 8,042,000,000	$ 7,049,000,000	$ 7,202,000,000
Non-utility revenues			310,000,000	369,000,000	362,000,000
Total			8,352,000,000	7,418,000,000	7,564,000,000
Expenses:
Utility natural gas, fuel and purchased power			2,127,000,000	1,488,000,000	1,762,000,000
Non-utility cost of revenues, including natural gas			208,000,000	257,000,000	257,000,000
Operation and maintenance			2,810,000,000	2,744,000,000	2,775,000,000
Depreciation and amortization			1,316,000,000	1,189,000,000	1,225,000,000
Taxes other than income taxes			528,000,000	516,000,000	474,000,000
Goodwill impairment	$ 0	$ 0	0	185,000,000	0
Total			6,989,000,000	6,379,000,000	6,493,000,000
Operating Income			1,363,000,000	1,039,000,000	1,071,000,000
Other Income (Expense):
Gain (loss) on equity securities			(172,000,000)	49,000,000	282,000,000
Gain (loss) on indexed debt securities			50,000,000	(60,000,000)	(292,000,000)
Gain on sale			8,000,000	0	0
Interest expense and other finance charges			(508,000,000)	(501,000,000)	(528,000,000)
Interest expense on Securitization Bonds			(21,000,000)	(28,000,000)	(39,000,000)
Other income, net			58,000,000	64,000,000	51,000,000
Total			(585,000,000)	(476,000,000)	(526,000,000)
Income from Continuing Operations Before Income Taxes			778,000,000	563,000,000	545,000,000
Income tax expense			110,000,000	80,000,000	30,000,000
Income From Continuing Operations			668,000,000	483,000,000	515,000,000
Net Income (Loss)			1,486,000,000	(773,000,000)	791,000,000
Income allocated to preferred shareholders			95,000,000	176,000,000	117,000,000
Income (Loss) Available to Common Shareholders			$ 1,391,000,000	$ (949,000,000)	$ 674,000,000
Earnings (loss) per common share:
Basic earnings per common share - continuing operations (in dollars per share)			$ 0.97	$ 0.58	$ 0.79
Basic earnings (loss) per common share - discontinued operations (in dollars per share)			1.38	(2.37)	0.55
Basic Earnings (Loss) Per Common Share (in dollars per share)			2.35	(1.79)	1.34
Earnings Per Share, Diluted [Abstract]
Diluted earnings per common share - continuing operations (in dollars per share)			0.94	0.58	0.79
Diluted earnings (loss) per common share - discontinued operations (in dollars per share)			1.34	(2.37)	0.54
Diluted Earnings (Loss) Per Common Share (in dollars per share)			$ 2.28	$ (1.79)	$ 1.33
Weighted Average Common Shares Outstanding, Basic			592,933	531,031	502,050
Weighted Average Common Shares Outstanding, Diluted			609,938	531,031	505,157