Reportable Segments - Financial Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating revenues	$ 9,321	$ 8,352	$ 7,418
Depreciation and Amortization	1,288	1,316	1,189
Interest Expense	(511)	(508)	(501)
Income Tax Expense (Benefit)	360	110	80
Net income (loss)	1,057	1,486	(773)
Total Assets	38,546	37,679
Expenditures for Long-Lived Assets	4,418	3,399	2,536
Interest income from securitization bonds	1	1	1
Total Regulatory Assets	3,578	3,716
Continuing Operations
Segment Reporting Information [Line Items]
Operating revenues	9,321	8,352	7,418
Depreciation and Amortization	1,288	1,316	1,189
Interest income	3	3	4
Interest Expense	(524)	(529)	(529)
Income Tax Expense (Benefit)	360	110	80
Income (loss) from continuing operations	1,057	668	483
Total Assets	38,546	35,341
Expenditures for Long-Lived Assets	4,415	3,228	2,515
Discontinued Operations
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	0	201	(333)
Net income (loss) from Discontinued Operations	0	818	(1,256)
Total Assets	0	2,338
Expenditures for Long-Lived Assets	3	171	21
Electric
Segment Reporting Information [Line Items]
Operating revenues	4,108	3,763	3,470
Natural Gas
Segment Reporting Information [Line Items]
Operating revenues	4,946	4,336	3,631
Corporate and Other
Segment Reporting Information [Line Items]
Operating revenues	267	253	317
Operating Segments | Electric
Segment Reporting Information [Line Items]
Operating revenues	4,108	3,763	3,470
Depreciation and Amortization	793	775	684
Interest income	4	0	3
Interest Expense	(235)	(226)	(220)
Income Tax Expense (Benefit)	147	95	72
Net income (loss)	603	475	230
Total Assets	19,024	16,548
Expenditures for Long-Lived Assets	2,611	2,008	1,281
Operating Segments | Natural Gas
Segment Reporting Information [Line Items]
Operating revenues	4,946	4,336	3,631
Depreciation and Amortization	466	527	491
Interest income	2	1	8
Interest Expense	(137)	(141)	(153)
Income Tax Expense (Benefit)	243	80	125
Net income (loss)	492	403	278
Total Assets	18,043	16,270
Expenditures for Long-Lived Assets	1,697	1,178	1,139
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Operating revenues	267	253	317
Depreciation and Amortization	29	14	14
Interest income	59	118	104
Interest Expense	(214)	(278)	(267)
Income Tax Expense (Benefit)	(30)	(65)	(117)
Net income (loss)	(38)	(210)	(25)
Total Assets	1,479	2,523
Expenditures for Long-Lived Assets	107	42	95
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Depreciation and Amortization	0	0	0
Interest income	(62)	(116)	(111)
Interest Expense	62	116	111
Income Tax Expense (Benefit)	0	0	0
Net income (loss)	0	0	$ 0
Benefit obligations | Corporate and Other
Segment Reporting Information [Line Items]
Total Regulatory Assets	$ 405	$ 427