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Subsidiary Debt - NPC - Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Par value $ 49,759  
Long-term Debt 49,866 $ 39,353
Current portion of long-term debt 1,839 2,539
Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 36,108  
Nevada Power Company [Member]    
Debt Instrument [Line Items]    
Par value 2,534  
Long-term Debt 2,496 2,351
Current portion of long-term debt 0 575
Long-term Debt, Excluding Current Maturities 2,496 $ 1,776
Nevada Power Company [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt 2,496  
NV Energy [Member]    
Debt Instrument [Line Items]    
Par value 3,701  
NV Energy [Member] | Subsidiary Debt [Member]    
Debt Instrument [Line Items]    
Par value 3,701  
NV Energy [Member] | Nevada Power Company [Member]    
Debt Instrument [Line Items]    
Par value 2,534  
NV Energy [Member] | Nevada Power Company [Member] | Mortgage Securities, 2.750%, Series BB due 2020 [Member]    
Debt Instrument [Line Items]    
Par value 0  
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, 2.400%, Series DD due 2030 [Member]    
Debt Instrument [Line Items]    
Par value 425  
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] | Mortgage Securities, 3.125%, Series EE due 2050 [Member]    
Debt Instrument [Line Items]    
Par value 300  
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.875%, Series 2017A, due 2032    
Debt Instrument [Line Items]    
Par value [1] 40  
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.65%, Series 2017, Due 2036    
Debt Instrument [Line Items]    
Par value [1] 40  
NV Energy [Member] | Nevada Power Company [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.65%, Series 2017B, due 2039    
Debt Instrument [Line Items]    
Par value [1] $ 13  
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%
Par value $ 0  
Long-term Debt $ 0 $ 575
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% 3.70%
Par value $ 500  
Long-term Debt $ 496 $ 496
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% 2.40%
Par value $ 425  
Long-term Debt $ 422 $ 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%
Par value $ 367  
Long-term Debt $ 359 $ 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%
Par value $ 349  
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%
Par value $ 250  
Long-term Debt $ 248 $ 248
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%
Par value $ 250  
Long-term Debt $ 237 $ 237
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% 3.125%
Par value $ 300  
Long-term Debt $ 297 $ 0
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.875%, Series 2017A, due 2032    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.875% 1.875%
Par value $ 40  
Long-term Debt [1] $ 39 $ 39
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.65%, Series 2017, Due 2036    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.65% 1.65%
Long-term Debt [1] $ 39 $ 39
NV Energy [Member] | Nevada Power Company [Member] | Subsidiary Debt [Member] | NPC Pollution Control Refunding Revenue Bonds, 1.65%, Series 2017B, due 2039    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.65% 1.65%
Long-term Debt [1] $ 13 $ 13
[1] Bonds were purchased by Nevada Power in May 2020 and re-offered at a fixed interest rate. Subject to mandatory purchase by Nevada Power in March 2023 at which date the interest rate may be adjusted.