Segment Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net income		$ 43	$ 45
Regulated and Unregulated Operating Revenue		310	331
Affiliate Revenue		53	50
Natural gas		54	77
Cost of identified MGP, landfill, or disposal sites under current investigation and/or remediation		13
Total revenues
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	[1]	310	331
Regulated Electric
Segment Reporting Information [Line Items]
Net income		33	33
Regulated Electric | Total revenues
Segment Reporting Information [Line Items]
Regulated Operating Revenue, Electric	[1]	256	254
Regulated Natural Gas
Segment Reporting Information [Line Items]
Net income		10	11
Revenues Including Intersegment Revenues		54	77
All Other
Segment Reporting Information [Line Items]
Net income		$ 0	$ 1

[1] Total revenues include $53 million and $50 million of affiliate electric revenue for the three months ended March 31, 2024 and 2023, respectively.