Commitments and Contingencies, Asset Retirement Obligations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		$ 28	[1]	$ 26	[2]
Accretion	[2]	1
Cash Flow Revisions		(7)	[1],[3]	1	[2],[4]
Ending balance	[1]	22		28
Steam, hydro and other production
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		10		9
Accretion		0		1
Cash Flow Revisions		(1)	[3]	0	[4]
Ending balance		9		10
Electric Plant Electric Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		5		5
Accretion		0		0
Cash Flow Revisions		0	[3]	0	[4]
Ending balance		5		5
Natural Gas Plant Gas Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		13		12
Accretion		1		0
Cash Flow Revisions		(6)	[3]	1	[4]
Ending balance		$ 8		$ 13

[1] Included in other long-term liabilities balance in the consolidated balance sheet.

[2] Included in other long-term liabilities balance in the consolidated balance sheet.

[3] In 2023, AROs were revised for changes in timing and estimates of cash flows. Changes in gas distribution AROs were a result of updated mileage of gas lines and number of services, as well as changes to inflation and discount rate assumptions.

[4] In 2022, AROs were revised for changes in timing and estimates of cash flows.