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Subsidiary Debt - NV Energy (Details) - USD ($)
$ in Millions
Mar. 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
PacifiCorp [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   7,705  
Other long-term debt   7,658 7,015
Northern Powergrid Holdings [Member]      
Debt Instrument [Line Items]      
Par value [1]   3,234  
Other long-term debt   3,221 2,626
Northern Powergrid Holdings [Member] | European Investment Bank loans, 2.564%, due 2027 [Member]      
Debt Instrument [Line Items]      
Par value [1]   332  
Other long-term debt   330 318
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   3,234  
Other long-term debt   $ 3,221 $ 2,626
Northern Powergrid Holdings [Member] | Subsidiary Debt [Member] | European Investment Bank loans, 2.564%, due 2027 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.564% 2.564%
MidAmerican Funding [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   $ 7,515  
Other long-term debt   7,427 $ 5,597
NV Energy [Member]      
Debt Instrument [Line Items]      
Par value   3,836  
Other long-term debt   3,821 3,817
NV Energy [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   3,836  
Other long-term debt   3,821 3,817
BHE Pipeline Group [Member]      
Debt Instrument [Line Items]      
Par value   1,250  
Other long-term debt   1,247 1,042
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] | Marshall Wind term loan, variable interest rate, due 2026 [Member]      
Debt Instrument [Line Items]      
Par value [2],[3]   77  
Other long-term debt [2],[3]   75 81
BHE Renewables [Member] | Subsidiary Debt [Member] | Grande Prairie Wind, Senior Notes, 3.860%, due 2037 [Member]      
Debt Instrument [Line Items]      
Par value [2]   358  
Other long-term debt   355 392
BHE Renewables [Member] | Subsidiary Debt [Member] | Topaz Solar Farms Senior Notes, 4.875%, due September 2015 through September 2039 [Member]      
Debt Instrument [Line Items]      
Par value [2]   195  
Other long-term debt [2]   193 205
HomeServices [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   213  
Other long-term debt   $ 213 $ 233
HomeServices [Member] | Subsidiary Debt [Member] | Variable-rate Term Loan - Due 2022 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.299% 4.022%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   1.60% 1.67%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.10% 4.10%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2024 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.95% 2.95%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.35% 3.35%
Minimum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.125%, Due 2049 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage    
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   1.80% 1.85%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 4.10% To 6.00%, Due 2039 To 2042 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.00% 6.00%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2018 Through 2024 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   8.53% 8.53%
Maximum [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | First Mortgage Bonds, 3.35% To 6.71%, Due 2024 to 2026 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.71% 6.71%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   $ 7,276  
Other long-term debt   7,208 $ 5,380
Eligible Property Subject To Lien Of Mortgages   20,000  
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | Tax-exempt bond obligations, variable rate, due 2023-2047 [Member]      
Debt Instrument [Line Items]      
Par value   370  
Other long-term debt   $ 368 $ 368
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   1.66% 1.74%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member]      
Debt Instrument [Line Items]      
Par value   $ 500  
Other long-term debt   $ 501 $ 501
Debt Instrument, Interest Rate, Stated Percentage   3.50% 3.50%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member]      
Debt Instrument [Line Items]      
Par value   $ 450  
Other long-term debt   $ 445 $ 445
Debt Instrument, Interest Rate, Stated Percentage   4.25% 4.25%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member]      
Debt Instrument [Line Items]      
Par value   $ 475  
Other long-term debt   $ 470 $ 470
Debt Instrument, Interest Rate, Stated Percentage   3.95% 3.95%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member]      
Debt Instrument [Line Items]      
Par value   $ 375  
Other long-term debt   $ 373 $ 372
Debt Instrument, Interest Rate, Stated Percentage   3.10% 3.10%
MidAmerican Energy Company [Member] | MidAmerican Funding [Member] | Subsidiary Debt [Member] | MEC First Mortgage Bonds, 3.65, Due 2048 [Member]      
Debt Instrument [Line Items]      
Par value   $ 700  
Other long-term debt   $ 688 $ 688
Debt Instrument, Interest Rate, Stated Percentage   3.65% 3.65%
NV Energy, Inc. [Member] | NV Energy [Member] | Senior Notes, 6.250%, due 2020 [Member]      
Debt Instrument [Line Items]      
Par value   $ 315  
Other long-term debt   $ 321 $ 330
NV Energy, Inc. [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Senior Notes, 6.250%, due 2020 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.25% 6.25%
Nevada Power Company [Member]      
Debt Instrument [Line Items]      
Par value   $ 2,384  
Eligible Property Subject To Lien Of Mortgages   8,700  
Nevada Power Company [Member] | NV Energy [Member]      
Debt Instrument [Line Items]      
Par value   2,384  
Other long-term debt   2,364 $ 2,366
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]      
Debt Instrument [Line Items]      
Par value   0  
Other long-term debt     500
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]      
Debt Instrument [Line Items]      
Par value   575  
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 3.700%, Series CC due 2029 [Member]      
Debt Instrument [Line Items]      
Par value   500  
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]      
Debt Instrument [Line Items]      
Par value   367  
Other long-term debt   360 360
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]      
Debt Instrument [Line Items]      
Par value   349  
Other long-term debt   348 348
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]      
Debt Instrument [Line Items]      
Par value   250  
Other long-term debt   249 248
Nevada Power Company [Member] | NV Energy [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]      
Debt Instrument [Line Items]      
Par value   250  
Other long-term debt   245 $ 244
Nevada Power Company [Member] | NV Energy [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]      
Debt Instrument [Line Items]      
Par value [4]   40  
Nevada Power Company [Member] | NV Energy [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]      
Debt Instrument [Line Items]      
Par value [4]   40  
Nevada Power Company [Member] | NV Energy [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]      
Debt Instrument [Line Items]      
Par value [4]   13  
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   $ 2,384  
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   7.125% 7.125%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.75% 2.75%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 3.700%, Series CC due 2029 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.70% 0.00%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.65% 6.65%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.75% 6.75%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.375% 5.375%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.45% 5.45%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.80% 1.80%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.60% 1.60%
Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.60% 1.60%
Sierra Pacific Power Company [Member]      
Debt Instrument [Line Items]      
Eligible Property Subject To Lien Of Mortgages   $ 4,200  
Sierra Pacific Power Company [Member] | NV Energy [Member]      
Debt Instrument [Line Items]      
Par value   1,137  
Other long-term debt   1,136 $ 1,121
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]      
Debt Instrument [Line Items]      
Par value   250  
Other long-term debt   249 249
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]      
Debt Instrument [Line Items]      
Par value   400  
Other long-term debt   396 396
Sierra Pacific Power Company [Member] | NV Energy [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]      
Debt Instrument [Line Items]      
Par value   252  
Other long-term debt   256 256
Sierra Pacific Power Company [Member] | NV Energy [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]      
Debt Instrument [Line Items]      
Par value   0  
Other long-term debt     20
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]      
Debt Instrument [Line Items]      
Par value   0  
Other long-term debt     58
Sierra Pacific Power Company [Member] | NV Energy [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]      
Debt Instrument [Line Items]      
Par value [5]   60  
Other long-term debt     62
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]      
Debt Instrument [Line Items]      
Par value [6]   0  
Other long-term debt     30
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]      
Debt Instrument [Line Items]      
Par value [7],[8]   25  
Other long-term debt     25
Sierra Pacific Power Company [Member] | NV Energy [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]      
Debt Instrument [Line Items]      
Par value [7],[8]   $ 25  
Other long-term debt     $ 25
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage securities, 3.375%, Series T due 2023 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.375% 3.375%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage securities, 2.600%, Series U due 2026 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.60% 2.60%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage securities, 6.750%, Series P due 2037 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.75% 6.75%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Pollution Control Refunding Revenue Bonds, 1.250%, Series 2016A, due 2029 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.25% 1.25%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Gas facilities refunding revenue bonds, 1.500%, series 2016A, due 2031 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.50% 1.50%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Gas and water facilities refunding revenue bonds, 3.000% series 2016B, due 2036 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.00% 3.00%
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.85%  
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.05%  
Sierra Pacific Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.05%  
Sierra Pacific Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     1.75%
Sierra Pacific Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     1.75%
Sierra Pacific Power Company [Member] | Minimum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     1.75%
Sierra Pacific Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016C, due 2036 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     1.82%
Sierra Pacific Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016D, due 2036 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     1.82%
Sierra Pacific Power Company [Member] | Maximum [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Water facilities refunding revenue bonds, series 2016E, due 2036 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     1.82%
Subsequent Event [Member] | Nevada Power Company [Member] | NV Energy [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]      
Debt Instrument [Line Items]      
Par value $ 575    
Debt Instrument, Interest Rate, Stated Percentage 2.75%    
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 4.1%, due 2042 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.10% 4.10%
Northern Natural Gas [Member] | BHE Pipeline Group [Member] | Subsidiary Debt [Member] | Senior Bonds, 4.30%, due 2049 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.30% 4.30%
[1] (1)The par values for these debt instruments are denominated in sterling.
[2] (1)Amortizes quarterly or semiannually.
[3] (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%.
[4] (1)Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time.
[5] (2)Subject to mandatory purchase by Sierra Pacific in June 2022 at which date the interest rate may be adjusted from time to time.
[6] (3)Bond was purchased by Sierra Pacific during 2019. As of December 31, 2018 the bond variable interest rate was 1.750% to 1.820%.
[7] (4)Bonds were purchased by Sierra Pacific during 2019 and re-offered at a fixed interest rate. As of December 31, 2018 the bonds variable interest rate was 1.750% to 1.820%.
[8] Subject to mandatory purchase by Sierra Pacific in April 2022 at which date the interest rate may be adjusted from time to time.