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Asset Retirement Obligations - Asset Retirement Obligation By Type (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation, Revision of Estimate $ 257 $ 10  
Asset Retirement Obligation 1,272 985 $ 954
Regulatory Liabilities 7,311 7,506  
Fossil Fuel Plant [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 623 371  
Quad Cities Station [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 358 345  
Wind Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 211 174  
Offshore pipeline facilities [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 15 33  
Solar Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 21 20  
Other Plant in Service [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 44 42  
Cost of removal      
Asset Retirement Obligations By Type [Line Items]      
Regulatory Liabilities [1] 2,370 2,426  
Quad Cities Station nuclear decommissioning trust funds [Member]      
Asset Retirement Obligations By Type [Line Items]      
Nuclear decommissioning trust funds 599 504  
MidAmerican Energy Company and Subsidiaries [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation, Revision of Estimate 234 (10)  
Asset Retirement Obligation 839 562 $ 559
MidAmerican Energy Company and Subsidiaries [Member] | Fossil Fuel Plant [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation, Revision of Estimate 237    
Asset Retirement Obligation 325 93  
MidAmerican Energy Company and Subsidiaries [Member] | Quad Cities Station [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 358 345  
MidAmerican Energy Company and Subsidiaries [Member] | Wind Generating Facility [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 154 123  
MidAmerican Energy Company and Subsidiaries [Member] | Other Plant in Service [Member]      
Asset Retirement Obligations By Type [Line Items]      
Asset Retirement Obligation 2 1  
MidAmerican Energy Company and Subsidiaries [Member] | Cost of removal      
Asset Retirement Obligations By Type [Line Items]      
Regulatory Liabilities 572 708  
MidAmerican Energy Company and Subsidiaries [Member] | Quad Cities Station nuclear decommissioning trust funds [Member]      
Asset Retirement Obligations By Type [Line Items]      
Nuclear decommissioning trust funds $ 599 $ 504  
[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.