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Income Taxes - PAC (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
State income tax, net of federal income tax impacts (4.00%) 3.00% 0.00% 2.00%
Income tax credits (31.00%) (20.00%) (29.00%) (23.00%)
Effects of ratemaking (6.00%) (2.00%) (5.00%) (2.00%)
Other 1.00% 0.00% 1.00% 0.00%
Effective income tax rate (21.00%) 3.00% (13.00%) (2.00%)
Years eligible for federal renewable energy production tax credit     10 years  
PAC        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
State income tax, net of federal income tax impacts 4.00% 3.00% 4.00% 3.00%
Income tax credits (20.00%) (15.00%) (20.00%) (12.00%)
Effects of ratemaking (13.00%) (4.00%) (14.00%) (8.00%)
Other (1.00%) 1.00% 0.00% 1.00%
Effective income tax rate (9.00%) 6.00% (9.00%) 5.00%
Years eligible for federal renewable energy production tax credit     10 years  
Effective income tax reconciliation, amortization of excess deferred income taxes $ 41 $ 6 $ 89 $ 41
PAC | State        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Effective income tax reconciliation, amortization of excess deferred income taxes     3 30
BHE | PAC        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Related party transaction, cash paid for (received) income taxes     $ (109) $ 79