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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting [Abstract]
Equity Method Investments	$ 228		$ 219
Segment Reporting Information [Line Items]
Electric	2,763	$ 2,633
Net income	418	380
Natural gas	1,288	1,090
Other	29	28
Regulated and Unregulated Operating Revenue	4,080	3,751
Equity Method Investments	228		219
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	4,081	3,751
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	(1)	0
Regulated Electric
Segment Reporting Information [Line Items]
Net income	296	278
Revenues Including Intersegment Revenues	2,763	2,633
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	228		219
Segment Reporting Information [Line Items]
Net income	159	130
Revenues Including Intersegment Revenues	1,289	1,090
Equity Method Investments	228		$ 219
Regulated Natural Gas | Operating Segments
Segment Reporting Information [Line Items]
Natural gas	1,288	1,090
Regulated Natural Gas | Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	1	0
All Other
Segment Reporting Information [Line Items]
Net income	(37)	(28)
All Other | Operating Segments
Segment Reporting Information [Line Items]
Other	$ 29	$ 28

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