Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting [Abstract]
Equity Method Investments	$ 240		$ 240		$ 219
Segment Reporting Information [Line Items]
Electric	2,601	$ 2,923	5,364	$ 5,556
Net income	288	328	706	708
Natural gas	393	476	1,681	1,566
Other	28	25	57	53
Regulated and Unregulated Operating Revenue	3,022	3,424	7,102	7,175
Equity Method Investments	240		240		219
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	3,022	3,425	7,104	7,176
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	0	(1)	(2)	(1)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	350	337	646	615
Revenues Including Intersegment Revenues	2,601	2,923	5,364	5,556
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	240		240		219
Segment Reporting Information [Line Items]
Net income	(22)	25	137	155
Revenues Including Intersegment Revenues	393	477	1,683	1,567
Equity Method Investments	240		240		$ 219
Regulated Natural Gas | Operating Segments
Segment Reporting Information [Line Items]
Natural gas	393	476	1,681	1,566
Regulated Natural Gas | Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	0	1	2	1
All Other
Segment Reporting Information [Line Items]
Net income	(40)	(34)	(77)	(62)
All Other | Operating Segments
Segment Reporting Information [Line Items]
Other	$ 28	$ 25	$ 57	$ 53