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Revenue from Contracts with Customers Revenue from Contracts with Customers - MEC (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax $ 3,564   $ 7,088    
Revenues 4,993 $ 4,554 9,433 $ 8,720  
Unbilled Contracts Receivable 722   722   $ 665
Regulated Operation [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 3,201   6,453    
Regulated Operation [Member] | Regulated retail electric [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,311   4,332    
Regulated Operation [Member] | Regulated retail gas [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 118   404    
Regulated Operation [Member] | Regulated wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 101   226    
Regulated Operation [Member] | Other customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 1   1    
MidAmerican Energy Company [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 709   1,449    
Revenues 717 $ 658 1,463 $ 1,353  
Unbilled Contracts Receivable 123   123   $ 89
MidAmerican Energy Company [Member] | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 8   14    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated retail [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 608   1,237    
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 238   567    
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 101   234    
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 200   350    
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 6   19    
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 63   67    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Regulated wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 86   180    
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   29    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 582   1,046    
Revenues 589   1,058    
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 505   892    
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 173   334    
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 80   151    
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 195   340    
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 57   67    
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 63   125    
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 14   29    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Electric Operations [Member] | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 7   12    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 126   400    
Revenues 127   402    
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 103   345    
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 65   233    
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 21   83    
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   10    
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 6   19    
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   0    
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 23   55    
MidAmerican Energy Company [Member] | Regulated Operation [Member] | Natural Gas Operations [Member] | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 1   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 1   3    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 1   3    
Revenues 1   3    
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 1   3    
MidAmerican Energy Company [Member] | Unregulated Operation [Member] | Corporate and Other [Member] | Non-contracts with customer revenue [Member]          
Disaggregation of Revenue [Line Items]          
Revenues $ 0   $ 0