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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net $ (85) $ (63)    
Cash collateral, net receivable, offset against derivative positions 48 47    
Derivative assets (liabilities), at fair value, net (37) (16)    
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 6 12    
Cash collateral, net receivable, offset against derivative positions (1) 0    
Derivative assets (liabilities), at fair value, net 5 12    
Other Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 4 2    
Cash collateral, net receivable, offset against derivative positions 0 0    
Derivative assets (liabilities), at fair value, net 4 2    
Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (48) (27)    
Cash collateral, net receivable, offset against derivative positions 21 20    
Derivative assets (liabilities), at fair value, net (27) (7)    
Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (47) (50)    
Cash collateral, net receivable, offset against derivative positions 28 27    
Derivative assets (liabilities), at fair value, net (19) (23)    
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 16 21    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (101) (84)    
Derivative, fair value, net (85) (63)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 84 62 $ 78 $ 96
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 10 15    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (4) (3)    
Derivative, fair value, net 6 12    
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 4 2    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 0 0    
Derivative, fair value, net 4 2    
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 4    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (50) (31)    
Derivative, fair value, net (48) (27)    
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 (47) (50)    
Derivative, fair value, net $ (47) $ (50)