Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting [Abstract]
Equity Method Investments	$ 220		$ 220		$ 208
Segment Reporting Information [Line Items]
Electric	2,923	$ 2,597	5,556	$ 5,467
Net income	328	311	708	673
Natural gas	476	449	1,566	1,096
Other	25	22	53	46
Regulated and Unregulated Operating Revenue	3,424	3,068	7,175	6,609
Equity Method Investments	220		220		208
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	3,425	3,069	7,176	6,611
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	(1)	(1)	(1)	(2)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	337	304	615	573
Revenues Including Intersegment Revenues	2,923	2,598	5,556	5,468
Regulated Electric | Operating Segments
Segment Reporting Information [Line Items]
Electric	2,923	2,597	5,556	5,467
Regulated Electric | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric	0	1	0	1
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	220		220		208
Segment Reporting Information [Line Items]
Net income	25	33	155	151
Revenues Including Intersegment Revenues	477	449	1,567	1,097
Equity Method Investments	220		220		$ 208
Regulated Natural Gas | Operating Segments
Segment Reporting Information [Line Items]
Natural gas	476	449	1,566	1,096
Regulated Natural Gas | Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	1	0	1	1
All Other
Segment Reporting Information [Line Items]
Net income	(34)	(26)	(62)	(51)
All Other | Operating Segments
Segment Reporting Information [Line Items]
Other	$ 25	$ 22	$ 53	$ 46