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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net $ (79) $ (97)    
Cash collateral, net receivable, offset against derivative positions 52 59    
Derivative assets (liabilities), at fair value, net (27) (38)    
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 29 27    
Cash collateral, net receivable, offset against derivative positions (3) (2)    
Derivative assets (liabilities), at fair value, net 26 25    
Other Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 8 3    
Cash collateral, net receivable, offset against derivative positions 0 0    
Derivative assets (liabilities), at fair value, net 8 3    
Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (53) (57)    
Cash collateral, net receivable, offset against derivative positions 16 16    
Derivative assets (liabilities), at fair value, net (37) (41)    
Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (63) (70)    
Cash collateral, net receivable, offset against derivative positions 39 45    
Derivative assets (liabilities), at fair value, net (24) (25)    
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative asset, fair value, gross asset including not subject to master netting arrangement 52 51    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (131) (148)    
Derivative, fair value, net (79) (97)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 78 96 $ 122 $ 101
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 37 36    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (8) (9)    
Derivative, fair value, net 29 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 8 4    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 0 (1)    
Derivative, fair value, net 8 3    
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 6 10    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (59) (67)    
Derivative, fair value, net (53) (57)    
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 1 1    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (64) (71)    
Derivative, fair value, net $ (63) $ (70)