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Income Taxes - MEC (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%
Income tax credits (31.00%) (20.00%) (29.00%) (23.00%)
State income tax, net of federal income tax impacts (4.00%) 3.00% 0.00% 2.00%
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  
Production tax credits     $ 1,200 $ 1,000
MEC        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Income tax credits (44.00%) (55.00%) (143.00%) (122.00%)
State income tax, net of federal income tax impacts (26.00%) (27.00%) (27.00%) (29.00%)
Effects of ratemaking (12.00%) (15.00%) (13.00%) (13.00%)
Other 0.00% 0.00% 0.00% 1.00%
Effective income tax rate (61.00%) (76.00%) (162.00%) (142.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits $ 103 $ 105 $ 400 $ 352
MEC | Berkshire Hathaway Energy        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Related party transaction, cash paid for (received) income taxes     $ (677) $ (500)