Property Plant and Equipment Property Plant and Equipment (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 24,101	$ 22,699
Accumulated depreciation		5,657	5,229
Property, plant and equipment, net		18,444	17,470
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		16,543	15,736
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		5,471	5,037
Common and other property
Property, Plant and Equipment [Line Items]
Property, plant and equipment		1,224	1,191
Plant to be retired
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	182	225
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 681	$ 510

[1] Includes regulator-approved retirements of Comanche Units 1 and 2 and jointly owned Craig Unit 1. Also includes PSCo’s planned retirement of jointly owned Craig Unit 2.