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Revenue from Contracts with Customers Revenue from Contracts with Customers - LLC - Customer Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 4,213 $ 4,270 $ 11,329 $ 11,358
Unregulated Operation [Member] | Nonregulated products and services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 460 426 1,106 1,061
Corporate and Other [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain] | Unregulated Operation [Member] | Nonregulated products and services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax   $ 0 $ 2 $ 2