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Asset Retirement Obligations - MEC - Asset Retirement Obligations By Type (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation $ 985 $ 954 $ 954
Regulatory Liabilities 7,506 7,511  
Quad Cities Unit Nos 1 and 2 [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 345 342  
Fossil Fuel Plant [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 371 380  
Wind Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 174 138  
Other Plant in Service [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 42 43  
MidAmerican Energy Company [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 562 559 $ 567
Decommissioning Fund Investments, Fair Value 504    
MidAmerican Energy Company [Member] | Quad Cities Unit Nos 1 and 2 [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 345 342  
MidAmerican Energy Company [Member] | Fossil Fuel Plant [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 93 113  
MidAmerican Energy Company [Member] | Wind Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 123 103  
MidAmerican Energy Company [Member] | Other Plant in Service [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 1 1  
Quad Cities Unit Nos 1 and 2 [Member] | MidAmerican Energy Company [Member]      
Asset Retirement Obligations By Type [Line Items]      
Decommissioning Fund Investments, Fair Value 504 515  
Removal Costs [Member]      
Asset Retirement Obligations By Type [Line Items]      
Regulatory Liabilities [1] 2,426 2,349  
Removal Costs [Member] | MidAmerican Energy Company [Member]      
Asset Retirement Obligations By Type [Line Items]      
Regulatory Liabilities $ 708 $ 688  
[1] Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.