Commitments and Contingencies, Asset Retirement Obligations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	[2]	$ 26	[1]	$ 22
Accretion	[3]	1
Cash Flow Revisions		1	[3],[4]	3	[2],[5]
Ending balance		28	[3]	26	[1],[2]
Steam, hydro and other production
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		9		8
Accretion		1		1
Cash Flow Revisions		0	[4]	0	[5]
Ending balance		10		9
Electric Plant Electric Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		5		5
Accretion		0		0
Cash Flow Revisions		0	[4]	0	[5]
Ending balance		5		5
Natural Gas Plant Gas Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		12		9
Accretion		0
Cash Flow Revisions		1	[4]	3	[5]
Ending balance		$ 13		$ 12

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

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

[5] In 2021, AROs were revised for changes in timing and estimates of cash flows. Changes in gas distribution AROs were primarily related to changes in labor rates coupled with increased gas line mileage and number of services.