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		$ 476		$ 422
Amounts Incurred	[1]			34
Accretion		21		19
Cash Flow Revisions		(114)	[2]	1	[3]
Ending balance		383		476
Electric Plant Steam and Other Production Ash Containment
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		180		152
Amounts Incurred	[1]			34
Accretion		8		6
Cash Flow Revisions		0	[2]	(12)	[3]
Ending balance		188		180
Electric Plant Wind Production
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		44		42
Amounts Incurred	[1]			0
Accretion		2		2
Cash Flow Revisions		0	[2]	0	[3]
Ending balance		46		44
Electric Plant Electric Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		17		16
Amounts Incurred	[1]			0
Accretion		0		1
Cash Flow Revisions		0	[2]	0	[3]
Ending balance		17		17
Natural Gas Plant Gas Transmission and Distribution
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		235		212
Amounts Incurred	[1]			0
Accretion		11		10
Cash Flow Revisions		(114)	[2]	13	[3]
Ending balance		$ 132		$ 235

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

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

[3] 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.