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Supplemental Cash Flow Disclosures - MidAmerican Funding (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]        
Cash and cash equivalents $ 627 $ 935    
Restricted Cash and Cash Equivalents, Current 227 327    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 883 1,283 $ 1,003 $ 1,332
Interest paid, net of amounts capitalized 1,713 1,715 1,673  
Income taxes received, net [1] 780 540 1,016  
Accruals related to property, plant and equipment additions 823 653 547  
MidAmerican Funding, LLC and Subsidiaries [Domain]        
Condensed Cash Flow Statements, Captions [Line Items]        
Cash and cash equivalents 1 172    
Restricted Cash and Cash Equivalents, Current 56 110    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 57 282 27 $ 105
Interest paid, net of amounts capitalized 218 218 204  
Income taxes received, net 511 472 609  
Accruals related to property, plant and equipment additions 371 224 131  
Dividend, Noncash, Transfer Of Operations $ 0 $ 0 $ 90  
[1] Includes $884 million, $636 million and $1.1 billion of income taxes received from Berkshire Hathaway in 2018, 2017 and 2016, respectively.