XML 110 R74.htm IDEA: XBRL DOCUMENT v3.10.0.1
Regulatory Matters - PAC (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Federal statutory income tax rate       21.00% 35.00% 21.00% 35.00% 35.00%
PacifiCorp [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Federal statutory income tax rate       21.00% 35.00% 21.00% 35.00% 35.00%
Public Utilities, Requested Rate Increase (Decrease), Percentage     1.00%          
Tax Cuts and Jobs Act of 2017 [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Federal statutory income tax rate           21.00%    
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Federal statutory income tax rate           21.00%    
Tax Cuts and Jobs Act of 2017 [Member] | PacifiCorp [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Loss Contingency, Accrual, Current       $ 112   $ 112    
Public Utilities Commission, Utah [Member] | PacifiCorp [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Public Utilities, Requested Rate Increase (Decrease), Percentage   3.00%            
Public Utilities, Approved Rate Increase (Decrease), Amount   $ 61            
Public Utilities Commission, Wyoming [Member] | PacifiCorp [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Public Utilities, Requested Rate Increase (Decrease), Percentage   3.00%            
Public Utilities, Approved Rate Increase (Decrease), Amount   $ 23            
Public Utilities Commission, Idaho [Member] | PacifiCorp [Member]                
Schedule Of Regulatory Assets and Liabilities [Line Items]                
Public Utilities, Requested Rate Increase (Decrease), Percentage 2.00%              
Public Utilities, Approved Rate Increase (Decrease), Amount $ 6