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Risk Management and Hedging Activities - PacifiCorp - Balance Sheet Location (Details) - PacifiCorp [Member] - Commodity derivative [Member] - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net $ (105)   $ (104)      
Cash collateral, net receivable, offset against derivative positions 70   74      
Derivative assets (liabilities), at fair value, net (35)   (30)      
Other Current Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net 4   8      
Cash collateral, net receivable, offset against derivative positions 0   0      
Derivative assets (liabilities), at fair value, net 4   8      
Other Assets [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net 6   1      
Cash collateral, net receivable, offset against derivative positions 0   0      
Derivative assets (liabilities), at fair value, net 6   1      
Other Current Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net (41)   (31)      
Cash collateral, net receivable, offset against derivative positions 18   17      
Derivative assets (liabilities), at fair value, net (23)   (14)      
Other Noncurrent Liabilities [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, fair value, net (74)   (82)      
Cash collateral, net receivable, offset against derivative positions 52   57      
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 20   13      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (125)   (117)      
Derivative, fair value, net (105)   (104)      
Net Regulatory Asset (Liability), Unrealized Loss (Gain) On Derivative Contracts 102 $ 116 101 $ 97 $ 95 $ 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 10   11      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (6)   (3)      
Derivative, fair value, net 4   8      
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   1      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (2)   0      
Derivative, fair value, net 6   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 6   1      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (47)   (32)      
Derivative, fair value, net (41)   (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 0   0      
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement (74)   (82)      
Derivative, fair value, net $ (74)   $ (82)