Selected Balance Sheet Data Balance Sheet Related Disclosures, Property, Plant and Equipment (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 24,851	$ 24,101
Less accumulated depreciation		(5,542)	(5,657)
Property, plant and equipment, net		19,309	18,444
Electric plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		15,468	16,543
Natural gas plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		5,760	5,471
Common and other property
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,341	1,224
Plant to be retired
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	[1]	1,326	182
Construction work in progress
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 956	$ 681

[1] Amounts as of Dec. 31, 2021 include Comanche Unit 1 and 2 and Craig Units 1 and 2. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Sept. 30, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion. Amounts are reported net of accumulated depreciation.