Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting [Abstract]
Equity Method Investments	$ 251		$ 251		$ 244
Segment Reporting Information [Line Items]
Electric	2,659	$ 2,601	5,344	$ 5,364
Net income	302	288	790	706
Natural gas	355	393	1,296	1,681
Other	14	28	37	57
Regulated and Unregulated Operating Revenue	3,028	3,022	6,677	7,102
Equity Method Investments	251		251		244
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	3,028	3,022	6,679	7,104
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue			(2)	(2)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	353	350	711	646
Revenues Including Intersegment Revenues	2,659	2,601	5,345	5,364
Regulated Electric | Operating Segments
Segment Reporting Information [Line Items]
Electric			5,344	5,364
Regulated Electric | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric			1	0
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	251		251		244
Segment Reporting Information [Line Items]
Net income	3	(22)	161	137
Revenues Including Intersegment Revenues			1,297	1,683
Equity Method Investments	251		251		$ 244
Regulated Natural Gas | Operating Segments
Segment Reporting Information [Line Items]
Natural gas	355	393	1,296	1,681
Regulated Natural Gas | Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas			1	2
All Other
Segment Reporting Information [Line Items]
Net income	(54)	(40)	(82)	(77)
All Other | Operating Segments
Segment Reporting Information [Line Items]
Other	$ 14	$ 28	$ 37	$ 57