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Subsidiary Debt Subsidiary Debt - AltaLink (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Par value $ 35,376  
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 28,780  
Other long-term debt 28,641 $ 27,354
ALP Investments [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value [1] 477  
Other long-term debt $ 481 $ 453
ALP Investments [Member] | Subsidiary Debt [Member] | Series 09-1 Senior Bonds, 5.207%, due 2016 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.207% 5.207%
ALP Investments [Member] | Subsidiary Debt [Member] | Series 12-1 Senior Bonds, 3.674%, due 2019 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.674% 3.674%
Par value [1] $ 159  
Other long-term debt $ 162 $ 153
ALP Investments [Member] | Subsidiary Debt [Member] | Series 13-1 Senior Bonds, 3.265%, due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.265% 3.265%
Par value [1] $ 159  
Other long-term debt $ 161 $ 152
ALP Investments [Member] | Subsidiary Debt [Member] | Series 15-1 Senior Bonds, 2.244%, due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.244% 2.244%
Par value [1] $ 159  
Other long-term debt 158 $ 148
AltaLink, L.P. [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value [1] 3,858  
Other long-term debt $ 3,840 $ 3,592
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2008-1 Notes, 5.243%, due 2018 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.243% 5.243%
Par value [1] $ 159  
Other long-term debt $ 159 $ 148
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-2 Notes, 3.621%, due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.621% 3.621%
Par value [1] $ 100  
Other long-term debt $ 99 $ 93
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2012-2 Notes, 2.978%, due 2022 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.978% 2.978%
Par value [1] $ 219  
Other long-term debt $ 218 $ 204
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-4 Notes, 3.668%, due 2023 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.668% 3.668%
Par value [1] $ 398  
Other long-term debt $ 397 $ 371
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-1 Notes, 3.399%, due 2024 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.399% 3.399%
Par value [1] $ 278  
Other long-term debt $ 278 $ 260
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2016-1 Notes, 2.747%, due 2026 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 2.747% 0.00%
Par value [1] $ 278  
Other long-term debt $ 277 $ 259
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2006-1 Notes, 5.249%, due 2036 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.249% 5.249%
Par value [1] $ 119  
Other long-term debt $ 119 $ 111
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2010-1 Notes, 5.381%, due 2040 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.381% 5.381%
Par value [1] $ 100  
Other long-term debt $ 99 $ 93
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2010-2 Notes, 4.872%, due 2040 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.872% 4.872%
Par value [1] $ 119  
Other long-term debt $ 119 $ 111
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2011-1 Notes, 4.462%, due 2041 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.462% 4.462%
Par value [1] $ 219  
Other long-term debt $ 218 $ 204
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2012-1 Notes, 3.99%, due 2042 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.99% 3.99%
Par value [1] $ 418  
Other long-term debt $ 412 $ 385
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-3 Notes, 4.922%, due 2043 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.922% 4.922%
Par value [1] $ 278  
Other long-term debt $ 278 $ 260
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-3 Notes, 4.054%, due 2044 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.054% 4.054%
Par value [1] $ 235  
Other long-term debt $ 233 $ 218
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2015-1 Notes, 4.090%, due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.09% 4.09%
Par value [1] $ 278  
Other long-term debt $ 277 $ 259
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2016-2 Notes, 3.717%, due 2046 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.717% 0.00%
Par value [1] $ 358  
Other long-term debt $ 356 $ 333
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-1 Notes, 4.446%, due 2053 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.446% 4.446%
Par value [1] $ 199  
Other long-term debt $ 198 $ 186
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-2 Notes, 4.274%, due 2064 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.274% 4.274%
Par value [1] $ 103  
Other long-term debt $ 103 $ 97
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Construction Loan, 4.950%, due 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.66% 0.00%
Par value [1] $ 13  
Other long-term debt 13 $ 13
BHE Transmission [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value [1] 4,348  
Other long-term debt $ 4,334 $ 4,058
[1] ns): Par Value(1) 2017 2016AltaLink Investments, L.P.: Series 12-1 Senior Bonds, 3.674%, due 2019$159 $162 $153Series 13-1 Senior Bonds, 3.265%, due 2020159 161 152Series 15-1 Senior Bonds, 2.244%, due 2022159 158 148Total AltaLink Investments, L.P.477 481 453 AltaLink, L.P.: Series 2008-1 Notes, 5.243%, due 2018159 159 148Series 2013-2 Notes, 3.621%, due 2020100 99 93Series 2012-2 Notes, 2.978%, due 2022219 218 204Series 2013-4 Notes, 3.668%, due 2023398 397 371Series 2014-1 Notes, 3.399%, due 2024278 278 260Series 2016-1 Notes, 2.747%, due 2026278 277 259Series 2006-1 Notes, 5.249%, due 2036119 119 111Series 2010-1 Notes, 5.381%, due 2040100 99 93Series 2010-2 Notes, 4.872%, due 2040119 119 111Series 2011-1 Notes, 4.462%, due 2041219 218 204Series 2012-1 Notes, 3.990%, due 2042418 412 385Series 2013-3 Notes, 4.922%, due 2043278 278 260Series 2014-3 Notes, 4.054%, due 2044235 233 218Series 2015-1 Notes, 4.090%, due 2045278 277 259Series 2016-2 Notes, 3.717%, due 2046358 356 333Series 2013-1 Notes, 4.446%, due 2053199 198 186Series 2014-2 Notes, 4.274%, due 2064103 103 97Total AltaLink, L.P.3,858 3,840 3,592 Other: Construction Loan, 5.660%, due 202013 13 13 Total BHE Transmission$4,348 $4,334 $4,058(1)The par values for these debt instruments are denominated in Canadian