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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net $ (102)   $ (97)      
Cash collateral, net receivable, offset against derivative positions 55   59      
Derivative assets (liabilities), at fair value, net (47)   (38)      
Other Current Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net 7   27      
Cash collateral, net receivable, offset against derivative positions (1)   (2)      
Derivative assets (liabilities), at fair value, net 6   25      
Other Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net 4   3      
Cash collateral, net receivable, offset against derivative positions 0   0      
Derivative assets (liabilities), at fair value, net 4   3      
Other Current Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net (54)   (57)      
Cash collateral, net receivable, offset against derivative positions 19   16      
Derivative assets (liabilities), at fair value, net (35)   (41)      
Other Noncurrent Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net (59)   (70)      
Cash collateral, net receivable, offset against derivative positions 37   45      
Derivative assets (liabilities), at fair value, net (22)   (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 27   51      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (129)   (148)      
Derivative, fair value, net (102)   (97)      
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 101 $ 78 96 $ 116 $ 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 13   36      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (6)   (9)      
Derivative, fair value, net 7   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 5   4      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (1)   (1)      
Derivative, fair value, net 4   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 9   10      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (63)   (67)      
Derivative, fair value, net (54)   (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 (59)   (71)      
Derivative, fair value, net $ (59)   $ (70)