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Subsidiary Debt Subsidiary Debt - AltaLink (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Par value $ 38,133  
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 27,314  
Other long-term debt 27,214 $ 26,848
ALP Investments [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value [1] 543  
Other long-term debt 556 492
ALP Investments [Member] | Subsidiary Debt [Member] | Series 09-1 Senior Bonds, 5.207%, due 2016 [Member]    
Debt Instrument [Line Items]    
Par value [1] 108  
Other long-term debt $ 112 $ 136
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]    
Par value [1] $ 145  
Other long-term debt $ 151 $ 180
Debt Instrument, Interest Rate, Stated Percentage 3.674% 3.674%
ALP Investments [Member] | Subsidiary Debt [Member] | Series 13-1 Senior Bonds, 3.265%, due 2020 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 145  
Other long-term debt $ 149 $ 176
Debt Instrument, Interest Rate, Stated Percentage 3.265% 3.265%
ALP Investments [Member] | Subsidiary Debt [Member] | Series 15-1 Senior Bonds, 2.244%, due 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 145  
Other long-term debt $ 144 $ 0
Debt Instrument, Interest Rate, Stated Percentage 2.244% 0.00%
AltaLink Holdings, L.P. [Member] | Subsidiary Debt [Member] | Senior debentures, 10.5%, due 2015 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 0  
Other long-term debt $ 0 $ 78
Debt Instrument, Interest Rate, Stated Percentage 0.00% 10.50%
AltaLink, L.P. [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 2,926  
Other long-term debt 2,911 $ 3,173
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2008-1 Notes, 5.243%, due 2018 [Member]    
Debt Instrument [Line Items]    
Par value [1] 145  
Other long-term debt $ 145 $ 171
Debt Instrument, Interest Rate, Stated Percentage 5.243% 5.243%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-2 Notes, 3.621%, due 2020 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 90  
Other long-term debt $ 90 $ 108
Debt Instrument, Interest Rate, Stated Percentage 3.621% 3.621%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2012-2 Notes, 2.978%, due 2022 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 199  
Other long-term debt $ 198 $ 236
Debt Instrument, Interest Rate, Stated Percentage 2.978% 2.978%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-4 Notes, 3.668%, due 2023 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 361  
Other long-term debt $ 360 $ 429
Debt Instrument, Interest Rate, Stated Percentage 3.668% 3.668%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-1 Notes, 3.399%, due 2024 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 253  
Other long-term debt $ 252 $ 300
Debt Instrument, Interest Rate, Stated Percentage 3.399% 3.399%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2006-1 Notes, 5.249%, due 2036 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 108  
Other long-term debt $ 108 $ 128
Debt Instrument, Interest Rate, Stated Percentage 5.249% 5.249%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2010-1 Notes, 5.381%, due 2040 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 90  
Other long-term debt $ 90 $ 108
Debt Instrument, Interest Rate, Stated Percentage 5.381% 5.381%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2010-2 Notes, 4.872%, due 2040 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 108  
Other long-term debt $ 108 $ 128
Debt Instrument, Interest Rate, Stated Percentage 4.872% 4.872%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2011-1 Notes, 4.462%, due 2041 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 199  
Other long-term debt $ 198 $ 236
Debt Instrument, Interest Rate, Stated Percentage 4.462% 4.462%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2012-1 Notes, 3.99%, due 2042 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 379  
Other long-term debt $ 374 $ 451
Debt Instrument, Interest Rate, Stated Percentage 3.99% 3.99%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-3 Notes, 4.922%, due 2043 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 253  
Other long-term debt $ 252 $ 300
Debt Instrument, Interest Rate, Stated Percentage 4.922% 4.922%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-3 Notes, 4.054%, due 2044 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 213  
Other long-term debt $ 212 $ 253
Debt Instrument, Interest Rate, Stated Percentage 4.054% 4.054%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2015-1 Notes, 4.090%, due 2045 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 253  
Other long-term debt $ 251 $ 0
Debt Instrument, Interest Rate, Stated Percentage 4.09% 0.00%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2013-1 Notes, 4.446%, due 2053 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 181  
Other long-term debt $ 180 $ 214
Debt Instrument, Interest Rate, Stated Percentage 4.446% 4.446%
AltaLink, L.P. [Member] | Subsidiary Debt [Member] | Series 2014-2 Notes, 4.274%, due 2064 [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 94  
Other long-term debt $ 93 $ 111
Debt Instrument, Interest Rate, Stated Percentage 4.274% 4.274%
BHE Transmission [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value [1] $ 3,469  
Other long-term debt $ 3,467 $ 3,743
[1] (1)The par values for these debt instruments are denominated in Canadian dollars.