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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity Contract [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net $ (97) $ (104)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 59 74    
Derivative Assets (Liabilities), at Fair Value, Net (38) (30)    
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 27 8    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions (2) 0    
Derivative Assets (Liabilities), at Fair Value, Net 25 8    
Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 3 1    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 0    
Derivative Assets (Liabilities), at Fair Value, Net 3 1    
Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (57) (31)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 16 17    
Derivative Assets (Liabilities), at Fair Value, Net (41) (14)    
Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (70) (82)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 45 57    
Derivative Assets (Liabilities), at Fair Value, Net (25) (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 51 13    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (148) (117)    
Derivative, Fair Value, Net (97) (104)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 96 101 $ 73 $ 133
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 36 11    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (9) (3)    
Derivative, Fair Value, Net 27 8    
Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 4 1    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (1) 0    
Derivative, Fair Value, Net 3 1    
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 10 1    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (67) (32)    
Derivative, Fair Value, Net (57) (31)    
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 0    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (71) (82)    
Derivative, Fair Value, Net $ (70) $ (82)