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Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 3,524    
Revenues 4,440 $ 4,166  
Unbilled Contracts Receivable 582   $ 665
Regulated Operation [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 3,252    
Regulated Operation [Member] | Regulated retail electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 2,021    
Regulated Operation [Member] | Regulated retail gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 286    
Regulated Operation [Member] | Regulated wholesale [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 125    
MidAmerican Energy Company [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 740    
Revenues 746 $ 695  
Unbilled Contracts Receivable 77   $ 89
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 6    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 629    
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 329    
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 133    
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 150    
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 13    
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 4    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 94    
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 15    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 464    
Revenues 469    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 387    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Residential [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 161    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Commercial [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 71    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Industrial [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 145    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated retail electric [Member] | Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 10    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Regulated wholesale [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 62    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Electricity Transmission [Member] | Multi value transmission projects [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 15    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Non-contracts with customer revenue [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 5    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 274    
Revenues 275    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 242    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Residential [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 168    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Commercial [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 62    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Industrial [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 5    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Natural gas distribution, transportation-only services [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 13    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated retail gas [Member] | Other [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax (6)    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Regulated wholesale [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 32    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Non-contracts with customer revenue [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1    
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    
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    
Revenues 2    
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    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Non-contracts with customer revenue [Member]      
Disaggregation of Revenue [Line Items]      
Revenues $ 0