Property Plant and Equipment Major classes of property, plant and equipment (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment		$ 65,464	$ 62,209
Accumulated depreciation and amortization		(17,502)	(17,060)
Property, plant and equipment, net		48,253	45,457
Electric plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		49,639	48,680
Natural gas plant
Property, Plant and Equipment [Line Items]
Property, plant and equipment		8,514	7,758
Common and other property
Property, Plant and Equipment [Line Items]
Property, plant and equipment		2,970	2,602
Plant to be retired
Property, Plant and Equipment [Line Items]
Property, plant and equipment	[1]	2,217	1,200
CWIP
Property, Plant and Equipment [Line Items]
Property, plant and equipment		2,124	1,969
Nuclear fuel
Property, Plant and Equipment [Line Items]
Property, plant and equipment		3,183	3,081
Accumulated depreciation and amortization		$ (2,892)	$ (2,773)

[1] Amounts as of Dec. 31, 2021 include Sherco Units 1, 2 and 3 and A.S. King for NSP-Minnesota; Comanche Unit 1 and 2 and Craig Units 1 and 2 for PSCo; and Tolk and coal generation assets at Harrington pending facility gas conversion for SPS. Following the June 2022 approval of PSCo’s revised resource plan settlement, amounts as of Dec. 31, 2022 include the addition of Comanche Unit 3, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion as well as the removal of Comanche Unit 1 that was retired in 2022. Amounts are presented net of accumulated depreciation.