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Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 35.00%
Income tax credits (16.00%) (32.00%) (30.00%)  
Effective Income Tax Rate Reconciliation Regulatory Differences (3.00%) (6.00%) (8.00%)  
State income tax, net of federal income tax benefit 3.00% (5.00%) (6.00%)  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 0.00% 0.00% (4.00%)  
Income tax effect of foreign income 0.00% (2.00%) (3.00%)  
Equity income 0.00% 0.00% (1.00%)  
Other, net (1.00%) (1.00%) (1.00%)  
Effective income tax rate 4.00% (25.00%) (30.00%)  
Production Tax Credit Carryforwards [Abstract]        
Years Eligible For Renewable Energy Production Tax Credit 10 years      
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Deferred state $ (424) $ 127 $ 131  
UNITED KINGDOM        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount $ 35      
Corporate Income Tax Rate, Effective April 1, 2020 [Member] | UNITED KINGDOM        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent (19.00%)      
Corporate Income Tax Rate, Effective April 1, 2020 further reduction [Member] | UNITED KINGDOM        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent (17.00%)      
PacifiCorp [Member]        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 35.00%
Income tax credits (13.00%) (3.00%) (7.00%)  
Effective Income Tax Rate Reconciliation Regulatory Differences (22.00%) (13.00%) (17.00%)  
State income tax, net of federal income tax benefit (3.00%) (3.00%) (4.00%)  
Other, net 0.00% (1.00%) 0.00%  
Effective income tax rate (11.00%) 7.00% 1.00%  
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Deferred state $ (1) $ (4) $ 9  
Parent Company [Member]        
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Income Taxes Receivable From (Payable To) Related Parties Current $ 13 $ 76