Reportable Segments - Financial Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues from External Customers	$ 8,696	$ 9,321	$ 8,352
Intersegment Revenues	0	0
Depreciation and Amortization	1,401	1,288	1,316
Interest income	9	3
Interest Expense	(701)	(524)
Income Tax Expense (Benefit)	170	360	110
Net income (loss)	917	1,057	1,486
Income (loss) from continuing operations	917	1,057
Total Assets	39,715	38,546
Expenditures for Long-Lived Assets	4,370	4,418	3,399
Interest income from securitization bonds	4	1	1
Total Regulatory Assets	2,674	3,578
Consolidated
Segment Reporting Information [Line Items]
Revenues from External Customers			8,352
Intersegment Revenues			0
Depreciation and Amortization			1,316
Interest income			3
Interest Expense			(529)
Income Tax Expense (Benefit)	170	360	110
Income (loss) from continuing operations			668
Total Assets	39,715	38,546
Expenditures for Long-Lived Assets	4,370	4,415	3,228
Discontinued Operations
Segment Reporting Information [Line Items]
Income Tax Expense (Benefit)	0	0	201
Net income from discontinued operations	0	0	818
Total Assets	0	0
Expenditures for Long-Lived Assets	0	3	171
Electric
Segment Reporting Information [Line Items]
Revenues from External Customers	4,290	4,108	3,763
Natural Gas
Segment Reporting Information [Line Items]
Revenues from External Customers	4,276	4,946	4,336
Corporate and Other
Segment Reporting Information [Line Items]
Revenues from External Customers	130	267	253
Operating Segments | Electric
Segment Reporting Information [Line Items]
Revenues from External Customers	4,290	4,108	3,763
Intersegment Revenues	0	0	0
Depreciation and Amortization	872	793	775
Interest income	19	4	0
Interest Expense	(303)	(235)	(226)
Income Tax Expense (Benefit)	189	147	95
Net income (loss)	654	603	475
Total Assets	21,089	19,024
Expenditures for Long-Lived Assets	2,660	2,611	2,008
Operating Segments | Natural Gas
Segment Reporting Information [Line Items]
Revenues from External Customers	4,276	4,946	4,336
Intersegment Revenues	3	0	0
Depreciation and Amortization	513	466	527
Interest income	10	2	1
Interest Expense	(188)	(137)	(141)
Income Tax Expense (Benefit)	(25)	243	80
Net income (loss)	533	492	403
Total Assets	17,429	18,043
Expenditures for Long-Lived Assets	1,697	1,697	1,178
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues from External Customers	130	267	253
Intersegment Revenues	0	0	0
Depreciation and Amortization	16	29	14
Interest income	34	59	118
Interest Expense	(264)	(214)	(278)
Income Tax Expense (Benefit)	6	(30)	(65)
Net income (loss)	(270)	(38)	(210)
Total Assets	1,197	1,479
Expenditures for Long-Lived Assets	13	107	42
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues from External Customers	0	0	0
Intersegment Revenues	(3)	0	0
Depreciation and Amortization	0	0	0
Interest income	(54)	(62)	(116)
Interest Expense	54	62	116
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	$ 385	$ 405