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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Segment Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting [Abstract]
Equity Method Investments	$ 247		$ 247		$ 244
Segment Reporting Information [Line Items]
Electric	3,393	$ 3,387	8,737	$ 8,751
Net income	682	656	1,472	1,362
Natural gas	239	245	1,535	1,926
Other	12	30	49	87
Regulated and Unregulated Operating Revenue	3,644	3,662	10,321	10,764
Equity Method Investments	247		247		244
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	3,644	3,663	10,323	10,767
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	0	(1)	(2)	(3)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	752	706	1,463	1,352
Revenues Including Intersegment Revenues	3,393	3,387	8,738	8,751
Regulated Electric \| Operating Segments
Segment Reporting Information [Line Items]
Electric			8,737	8,751
Regulated Electric \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric			1	0
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments					244
Segment Reporting Information [Line Items]
Net income	(36)	(21)	125	116
Revenues Including Intersegment Revenues	239	246	1,536	1,929
Equity Method Investments					$ 244
Regulated Natural Gas \| Operating Segments
Segment Reporting Information [Line Items]
Natural gas	239	245	1,535	1,926
Regulated Natural Gas \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	0	1	1	3
All Other
Segment Reporting Information [Line Items]
Net income	(34)	(29)	(116)	(106)
All Other \| Operating Segments
Segment Reporting Information [Line Items]
Other	$ 12	$ 30	$ 49	$ 87