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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity Contract [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net $ (63) $ (97)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 47 59    
Derivative Assets (Liabilities), at Fair Value, Net (16) (38)    
Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 12 27    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 (2)    
Derivative Assets (Liabilities), at Fair Value, Net 12 25    
Other Noncurrent Assets [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net 2 3    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 0 0    
Derivative Assets (Liabilities), at Fair Value, Net 2 3    
Other Current Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (27) (57)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 20 16    
Derivative Assets (Liabilities), at Fair Value, Net (7) (41)    
Other Noncurrent Liabilities [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Fair Value, Net (50) (70)    
Cash Collateral, Net Receivable (Payable), Offset Against Derivative Positions 27 45    
Derivative Assets (Liabilities), at Fair Value, Net (23) (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 21 51    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (84) (148)    
Derivative, Fair Value, Net (63) (97)    
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 62 96 $ 101 $ 73
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 15 36    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (3) (9)    
Derivative, Fair Value, Net 12 27    
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 2 4    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 0 (1)    
Derivative, Fair Value, Net 2 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 4 10    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (31) (67)    
Derivative, Fair Value, Net (27) (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 0 1    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (50) (71)    
Derivative, Fair Value, Net $ (50) $ (70)