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Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax $ 4,270   $ 11,358    
Operating revenue 5,637 $ 5,283 15,070 $ 14,003  
Unbilled Contracts Receivable 624   624   $ 665
Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Operating revenue 149   460    
Regulated Operation [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 3,844   10,297    
Regulated Operation [Member] | Regulated retail electric [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,971   7,303    
Regulated Operation [Member] | Regulated retail gas [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 96   500    
Regulated Operation [Member] | Regulated wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 80   306    
Regulated Operation [Member] | Other customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   1    
MidAmerican Energy Company [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 828   2,277    
Operating revenue 832 813 2,295 2,166  
Unbilled Contracts Receivable 98   98   $ 89
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Operating revenue 4   18    
MidAmerican Energy Company [Member] | Regulated electric          
Disaggregation of Revenue [Line Items]          
Operating revenue 727 707 1,785 1,677  
MidAmerican Energy Company [Member] | Regulated natural gas          
Disaggregation of Revenue [Line Items]          
Operating revenue 103 103 505 485  
MidAmerican Energy Company [Member] | Corporate and Other [Member]          
Disaggregation of Revenue [Line Items]          
Operating revenue 2 $ 3 5 $ 4  
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 730   1,967    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Residential [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 287   854    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Commercial [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 117   351    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Industrial [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 271   621    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Natural gas distribution, transportation-only services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 8   27    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member] | Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 47   114    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 82   262    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 14   43    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 723   1,769    
Operating revenue 727   1,785    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 647   1,539    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Residential [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 233   567    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Commercial [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 100   251    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Industrial [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 268   608    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated retail electric [Member] | Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 46   113    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Regulated wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 62   187    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Electricity Transmission [Member] | Multi value transmission projects [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 14   43    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated electric | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Operating revenue 4   16    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 103   503    
Operating revenue 103   505    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 83   428    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Residential [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 54   287    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Commercial [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 17   100    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Industrial [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 3   13    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 8   27    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated retail gas [Member] | Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 1   1    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Regulated wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 20   75    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated natural gas | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Operating revenue 0   2    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Other customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2   5    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2   5    
Operating revenue 2   5    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Other customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2   5    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Operating revenue $ 0   $ 0