Commitments and Contingencies - Legal Matters (Details) - 2020 Wildfires - PacifiCorp [Member] a in Millions, $ in Millions	1 Months Ended	7 Months Ended
Sep. 30, 2020 a naturalGasProducer	Mar. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Number of Acres Burned \| a	0.5
Number of Structures Destroyed \| naturalGasProducer	2,000
Fire Suppression Costs		$ 150
Loss Contingency, Estimate of Possible Loss		$ 136

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant