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Employee Benefit Plans - Plan Assumptions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components 3    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components (2)    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 49    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation (39)    
UK Pension Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.40% 4.80% 5.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 2.80% 2.80% 3.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Rate Of Future Price Inflation 2.80% 2.80% 3.20%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.80% 5.50% 5.70%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 6.10% 6.80% 6.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 2.80% 3.20% 2.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Rate of Future Price Inflation 2.80% 3.20% 3.20%
PacifiCorp [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 8.00% 8.50%  
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00% 5.00%  
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 2018 2016  
PacifiCorp [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.05% 4.90% 5.35%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 3.00% 3.50% 3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.90% 5.35% 5.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.50% 7.50% 7.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 3.50% 3.50% 3.00%
PacifiCorp [Member] | Domestic Other Postretirement Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.10% 4.95% 5.45%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.95% 5.45% 5.85%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.50% 7.50% 7.75%
MidAmerican Energy Company [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year 8.00% 7.40%  
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00% 5.00%  
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate 2018 2016  
MidAmerican Energy Company [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00% 4.75% 5.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 3.00% 3.50% 3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.75% 5.50% 6.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.50% 7.50% 7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase 3.50% 3.50% 3.00%
MidAmerican Energy Company [Member] | Domestic Other Postretirement Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.75% 4.75% 5.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.75% 5.50% 6.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.50% 7.50% 7.50%