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Segment Information Segment Information - MEC (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
OperatingSegments
ReportableSegments
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | OperatingSegments     8    
Operating revenue $ 5,644 $ 5,637 $ 15,148 $ 15,070  
Operating income 1,450 1,523 3,328 3,366  
Interest expense (475) (453) (1,428) (1,380)  
Capitalized interest 23 17 56 44  
Allowance for equity funds 56 30 126 75  
Other, net 2 19 67 50  
Income before income tax (benefit) expense and equity income 847 1,423 1,944 1,904  
Assets 97,913   $ 97,913   $ 92,189
MidAmerican Energy Company [Member]          
Segment Reporting Information [Line Items]          
Number of reportable segments | ReportableSegments     2    
Operating revenue 796 832 $ 2,297 2,295  
Operating income 234 278 443 444  
Interest expense (68) (56) (207) (170)  
Capitalized interest 7 6 20 14  
Allowance for equity funds 27 16 59 39  
Other, net 4 13 34 34  
Income before income tax (benefit) expense and equity income 204 257 349 361  
Assets 19,694   19,694   17,920
MidAmerican Energy Company [Member] | Regulated electric          
Segment Reporting Information [Line Items]          
Operating revenue 712 727 1,792 1,785  
Operating income 243 278 396 392  
Assets 18,341   18,341   16,511
MidAmerican Energy Company [Member] | Regulated natural gas          
Segment Reporting Information [Line Items]          
Operating revenue 76 103 482 505  
Operating income (8) 1 45 52  
Assets 1,343   1,343   1,406
MidAmerican Energy Company [Member] | Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Operating revenue 8 2 23 5  
Operating income (1) $ (1) 2 $ 0  
Assets $ 10   $ 10   $ 3