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		$ 422		$ 399
Amounts Incurred	[1]	34
Accretion		(19)		(16)
Cash Flow Revisions		1	[2]	7	[3]
Ending balance		476		422
Electric Plant Steam and Other Production Ash Containment
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		152		137
Amounts Incurred	[1]	34
Accretion		(6)		(5)
Cash Flow Revisions		(12)	[2]	10	[3]
Ending balance		180		152
Electric Plant Wind Production
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		42		40
Amounts Incurred	[1]	0
Accretion		(2)		(2)
Cash Flow Revisions		0	[2]	0	[3]
Ending balance		44		42
Electric Plant Electric Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		16		15
Amounts Incurred	[1]	0
Accretion		(1)		(1)
Cash Flow Revisions		0	[2]	0	[3]
Ending balance		17		16
Natural Gas Plant Gas Transmission and Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		204		203
Amounts Incurred	[1]	0
Accretion		(10)		(9)
Cash Flow Revisions		20	[2]	(8)	[3]
Ending balance		234		204
Natural Gas Plant Other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		8		3
Amounts Incurred	[1]	0
Accretion		0		0
Cash Flow Revisions		(7)	[2]	5	[3]
Ending balance		1		8
Common and Other Property Common Miscellaneous
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		$ 0		1
Accretion				(1)
Cash Flow Revisions	[3]			0
Ending balance				$ 0

[1] Amounts incurred relate to steam production pond remediation costs.

[2] In 2022, AROs were revised for changes in timing and estimates of cash flows. Revisions in steam, hydro, and other production AROs primarily related to changes in cost estimates for remediation of ash containment facilities. Changes in gas transmission and distribution AROs were primarily related to changes in labor rates coupled with increased gas line mileage and number of services.

[3] In 2021, AROs were revised for changes in timing and estimates of cash flows. Revisions in steam, hydro, and other production AROs primarily related to changes in cost estimates for remediation of ash containment facilities. Changes in gas transmission and distribution AROs were primarily related to changes in labor rates coupled with increased gas line mileage and number of services.