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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net $ 0 $ (17)    
Cash collateral, net receivable, offset against derivative positions 17 24    
Derivative assets (liabilities), at fair value, net 17 7    
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 43 27    
Cash collateral, net receivable, offset against derivative positions 0 0    
Derivative assets (liabilities), at fair value, net 43 27    
Other Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 6 6    
Cash collateral, net receivable, offset against derivative positions 0 0    
Derivative assets (liabilities), at fair value, net 6 6    
Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (25) (22)    
Cash collateral, net receivable, offset against derivative positions 13 15    
Derivative assets (liabilities), at fair value, net (12) (7)    
Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (24) (28)    
Cash collateral, net receivable, offset against derivative positions 4 9    
Derivative assets (liabilities), at fair value, net (20) (19)    
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 53 36    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (53) (53)    
Derivative, fair value, net 0 (17)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 0 17 $ 84 $ 62
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 45 29    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (2) (2)    
Derivative, fair value, net 43 27    
Not Designated as Hedging Instrument [Member] | Other Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 6 6    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 0 0    
Derivative, fair value, net 6 6    
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 2 1    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (27) (23)    
Derivative, fair value, net (25) (22)    
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 0 0    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (24) (28)    
Derivative, fair value, net $ (24) $ (28)