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Subsidiary Debt - BHE Renewables (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Par value   $ 39,634  
Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   30,883  
Other long-term debt   30,672 $ 27,573
BHE Renewables [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   3,239  
Other long-term debt   $ 3,206 $ 3,401
BHE Renewables [Member] | Subsidiary Debt [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   3.21% 3.21%
BHE Renewables [Member] | Subsidiary Debt [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   5.41% 5.41%
BHE Renewables [Member] | Subsidiary Debt [Member] | Bishop Hill Holdings Senior Notes, 5.125%, due 2032 [Member]      
Debt Instrument [Line Items]      
Par value [1]   $ 78  
Other long-term debt [1]   77 $ 84
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 3.950%, due June 2035 [Member]      
Debt Instrument [Line Items]      
Par value [1]   283  
Other long-term debt [1]   280 292
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 5.375%, due June 2035 [Member]      
Debt Instrument [Line Items]      
Par value [1]   894  
Other long-term debt [1]   886 915
BHE Renewables [Member] | Subsidiary Debt [Member] | Grande Prairie Wind, Senior Notes, 3.860%, due 2037 [Member]      
Debt Instrument [Line Items]      
Par value [1]   358  
Other long-term debt   355 392
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 5.75%, due 2039 [Member]      
Debt Instrument [Line Items]      
Par value [1]   680  
Other long-term debt [1]   672 709
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 4.875%, due 2039      
Debt Instrument [Line Items]      
Par value [1]   195  
Other long-term debt [1]   193 205
BHE Renewables [Member] | Subsidiary Debt [Member] | Alamo 6 Senior Notes, 4.170%, due 2042 [Member]      
Debt Instrument [Line Items]      
Par value [1]   216  
Other long-term debt [1]   213 221
BHE Renewables [Member] | Subsidiary Debt [Member] | Other debt obligations [Member]      
Debt Instrument [Line Items]      
Par value [1]   13  
Other long-term debt [1]   13 16
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loan, due 2020 [Member]      
Debt Instrument [Line Items]      
Par value [1],[2]   284  
Other long-term debt [1],[2]   284 310
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loans, due 2019 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Repurchased Face Amount $ 284    
BHE Renewables [Member] | Subsidiary Debt [Member] | TX Jumbo Road Term Loan, 3.626% due 2025 [Member]      
Debt Instrument [Line Items]      
Par value [1],[2]   161  
Other long-term debt [1],[2]   158 176
BHE Renewables [Member] | Subsidiary Debt [Member] | Marshall Wind term loan, variable interest rate, due 2026 [Member]      
Debt Instrument [Line Items]      
Par value [1],[2]   77  
Other long-term debt [1],[2]   $ 75 $ 81
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loan, due 2034 [Member]      
Debt Instrument [Line Items]      
Other long-term debt [1],[2] $ 382    
BHE Renewables [Member] | Subsidiary Debt [Member] | Bishop Hill Holdings Senior Notes, 5.125%, due 2032 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.125% 5.125%
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 3.950%, due June 2035 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.95% 3.95%
BHE Renewables [Member] | Subsidiary Debt [Member] | Solar Star Funding, LLC Series A Senior Secured Notes, 5.375%, due June 2035 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.375% 5.375%
BHE Renewables [Member] | Subsidiary Debt [Member] | Grande Prairie Wind, Senior Notes, 3.860%, due 2037 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.86% 3.86%
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 5.75%, due 2039 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.75% 5.75%
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 4.875%, due 2039      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.875% 4.875%
BHE Renewables [Member] | Subsidiary Debt [Member] | Alamo 6, LLC Senior Secured Notes, 4.17%, due March 2018 through March 2042 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.17% 4.17%
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loan, due 2020 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.69%  
BHE Renewables [Member] | Subsidiary Debt [Member] | Pinyon Pines I and II Term Loans, due 2019 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage     4.55%
BHE Renewables [Member] | Subsidiary Debt [Member] | TX Jumbo Road Term Loan, 3.626% due 2025 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.626% 3.626%
BHE Renewables [Member] | Subsidiary Debt [Member] | Marshall Wind term loan, variable interest rate, due 2026 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.212% 3.212%
[1] (1)Amortizes quarterly or semiannually.
[2] (2)The term loans have variable interest rates based on LIBOR plus a margin that varies during the terms of the agreements. The Company has entered into interest rate swaps that fix the interest rate on 75% of the Pinyon Pines outstanding debt through December 31, 2019 and 50% of the Pinyon Pines outstanding debt thereafter, and 100% of the TX Jumbo Road and Marshall Wind outstanding debt. The variable interest rate as of December 31, 2019 and 2018 was 3.69% and 4.55%, respectively, while the fixed interest rates as of December 31, 2019 and 2018 ranged from 3.21% to 5.41%.