Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting [Abstract]
Equity Method Investments	$ 244		$ 244		$ 219
Segment Reporting Information [Line Items]
Electric	3,387	$ 3,699	8,751	$ 9,255
Net income	656	649	1,362	1,357
Natural gas	245	357	1,926	1,923
Other	30	26	87	79
Regulated and Unregulated Operating Revenue	3,662	4,082	10,764	11,257
Equity Method Investments	244		244		219
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	3,663	4,083	10,767	11,259
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	(1)	(1)	(3)	(2)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	706	697	1,352	1,312
Revenues Including Intersegment Revenues	3,387	3,699	8,751	9,256
Regulated Electric | Operating Segments
Segment Reporting Information [Line Items]
Electric			8,751	9,255
Regulated Electric | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric			0	1
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	244		244		219
Segment Reporting Information [Line Items]
Net income	(21)	(7)	116	148
Revenues Including Intersegment Revenues	246	358	1,929	1,924
Equity Method Investments	244		244		$ 219
Regulated Natural Gas | Operating Segments
Segment Reporting Information [Line Items]
Natural gas	245	357	1,926	1,923
Regulated Natural Gas | Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	1	1	3	1
All Other
Segment Reporting Information [Line Items]
Net income	(29)	(41)	(106)	(103)
All Other | Operating Segments
Segment Reporting Information [Line Items]
Other	$ 30	$ 26	$ 87	$ 79