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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
Segment Information (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting [Abstract]
Equity Method Investments	$ 247		$ 244
Segment Reporting Information [Line Items]
Electric	2,685	$ 2,763
Net income	488	418
Natural gas	941	1,288
Other	23	29
Regulated and Unregulated Operating Revenue	3,649	4,080
Equity Method Investments	247		244
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	3,651	4,081
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	(2)	(1)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	358	296
Revenues Including Intersegment Revenues	2,686	2,763
Regulated Electric \| Operating Segments
Segment Reporting Information [Line Items]
Electric	2,685	2,763
Regulated Electric \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric	1	0
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	247		244
Segment Reporting Information [Line Items]
Net income	158	159
Revenues Including Intersegment Revenues	942	1,289
Equity Method Investments	247		$ 244
Regulated Natural Gas \| Operating Segments
Segment Reporting Information [Line Items]
Natural gas	941	1,288
Regulated Natural Gas \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	1	1
All Other
Segment Reporting Information [Line Items]
Net income	(28)	(37)
All Other \| Operating Segments
Segment Reporting Information [Line Items]
Other	$ 23	$ 29