XML 348 R148.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Subsidiary Debt Subsidiary Debt - NPC - Long-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Par value   $ 39,634  
Current portion of long-term debt   2,539 $ 2,081
Long-term Debt   39,353 36,774
Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   30,883  
Nevada Power Company [Member]      
Debt Instrument [Line Items]      
Par value   2,384  
Current portion of long-term debt   575 500
Long-term Debt, Excluding Current Maturities   1,776 1,853
Long-term Debt   2,351 $ 2,353
Nevada Power Company [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt   2,351  
NV Energy [Member]      
Debt Instrument [Line Items]      
Par value   3,836  
NV Energy [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   3,836  
NV Energy [Member] | Nevada Power Company [Member]      
Debt Instrument [Line Items]      
Par value   2,384  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 7.125%, Series V due 2019 [Member]      
Debt Instrument [Line Items]      
Par value   0  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]      
Debt Instrument [Line Items]      
Par value   575  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 3.700%, Series CC due 2029 [Member]      
Debt Instrument [Line Items]      
Par value   500  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 6.650%, Series N due 2036 [Member]      
Debt Instrument [Line Items]      
Par value   367  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 6.750%, Series R due 2037 [Member]      
Debt Instrument [Line Items]      
Par value   349  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 5.375%, Series X due 2040 [Member]      
Debt Instrument [Line Items]      
Par value   250  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 5.450%, Series Y due 2041 [Member]      
Debt Instrument [Line Items]      
Par value   250  
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.80%, Series 2017A, due 2032 [Member]      
Debt Instrument [Line Items]      
Par value [1]   40  
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017, Due 2036 [Member]      
Debt Instrument [Line Items]      
Par value [1]   40  
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.60%, Series 2017B, due 2039 [Member]      
Debt Instrument [Line Items]      
Par value [1]   13  
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   $ 2,384  
NV Energy [Member] | Nevada Power Company [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%
Current portion of long-term debt   $ 0 $ 500
NV Energy [Member] | Nevada Power Company [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%
Current portion of long-term debt   $ 575  
Long-term Debt     $ 574
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt   $ 496 $ 0
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt   $ 358 $ 358
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt   $ 346 $ 346
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt   $ 248 $ 247
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt   $ 237 $ 236
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt [1]   $ 39 $ 40
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt [1]   $ 39 $ 39
NV Energy [Member] | Nevada Power Company [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%
Long-term Debt [1]   $ 13 $ 13
Subsequent Event [Member] | NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 2.400%, Series DD due 2030 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.40%    
Par value $ 425    
Subsequent Event [Member] | NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | Mortgage Securities, 3.125%, Series EE due 2050 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.125%    
Par value $ 300    
Subsequent Event [Member] | NV Energy [Member] | Nevada Power Company [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%    
Early Repayment of Senior Debt $ 575    
Par value $ 575    
[1] (1)Subject to mandatory purchase by Nevada Power in May 2020 at which date the interest rate may be adjusted from time to time.