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Asset Retirement Obligations - MEC - Asset Retirement Obligations By Type (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation $ 1,272 $ 985 $ 954
Regulatory Liabilities 7,311 7,506  
Quad Cities Unit Nos 1 and 2 [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 358 345  
Fossil Fuel Plant [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 623 371  
Wind Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 211 174  
Other Plant in Service [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 44 42  
MidAmerican Energy Company [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 839 562 $ 559
MidAmerican Energy Company [Member] | Quad Cities Unit Nos 1 and 2 [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 358 345  
MidAmerican Energy Company [Member] | Fossil Fuel Plant [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 325 93  
MidAmerican Energy Company [Member] | Wind Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 154 123  
MidAmerican Energy Company [Member] | Other Plant in Service [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 2 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 599 504  
Cost of removal      
Asset Retirement Obligations By Type [Line Items]      
Regulatory Liabilities [1] 2,370 2,426  
Cost of removal | MidAmerican Energy Company [Member]      
Asset Retirement Obligations By Type [Line Items]      
Regulatory Liabilities $ 572 $ 708  
[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.