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Summary of Significant Accounting Policies (Details) - PSCo $ in Millions	Oct. 25, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Recovered Winter Storm Uri Deferred net natural gas, fuel, and purchased energy costs - electric utility	$ 263
Recovered Winter Storm Uri Deferred net natural gas, fuel, and purchased energy costs - natural gas utility	287
Carrying charges through a rider mechanism	0
Electric customers refunds	41
Foregone recovery of replacement power costs	14
Incremental bad debt expense	$ 11