Long-term Debt - NPC (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Par value	$ 51,702
Total long-term debt	51,635	$ 49,762
2024	3,018
2028 and thereafter	40,480
Total	51,702
Subsidiary debt
Debt Instrument [Line Items]
Par value	37,501
Total	37,501
NPC
Debt Instrument [Line Items]
Par value	3,234
Total long-term debt	3,195	$ 2,499
Total	3,234
Eligible property subject to lien of mortgages	9,800
NPC \| Subsidiary debt
Debt Instrument [Line Items]
Total long-term debt	3,195
2024	300
2028 and thereafter	2,934
Unamortized discount and debt issuance costs	(39)
NV Energy \| Subsidiary debt
Debt Instrument [Line Items]
Par value	4,386
2024	300
2028 and thereafter	3,436
Total	4,386
NV Energy \| NPC \| 3.700% Series CC, due 2029
Debt Instrument [Line Items]
Par value	500
Total	500
NV Energy \| NPC \| 2.400% Series DD, due 2030
Debt Instrument [Line Items]
Par value	425
Total	425
NV Energy \| NPC \| 6.650% Series N, due 2036
Debt Instrument [Line Items]
Par value	367
Total	367
NV Energy \| NPC \| 6.750% Series R, due 2037
Debt Instrument [Line Items]
Par value	349
Total	349
NV Energy \| NPC \| 5.375% Series X, due 2040
Debt Instrument [Line Items]
Par value	250
Total	250
NV Energy \| NPC \| 5.450% Series Y, due 2041
Debt Instrument [Line Items]
Par value	250
Total	250
NV Energy \| NPC \| 3.125% Series EE, due 2050
Debt Instrument [Line Items]
Par value	300
Total	300
NV Energy \| NPC \| 5.900% Series GG, due 2053
Debt Instrument [Line Items]
Par value	400
Total	400
NV Energy \| NPC \| 1.875% Pollution Control Bonds Series 2017A, due 2032
Debt Instrument [Line Items]
Par value	40
Total	40
NV Energy \| NPC \| 1.650% Pollution Control Bonds Series 2017, due 2036
Debt Instrument [Line Items]
Par value	40
Total	40
NV Energy \| NPC \| 1.650% Pollution Control Bonds Series 2017B, due 2039
Debt Instrument [Line Items]
Par value	13
Total	13
NV Energy \| NPC \| Variable-rate 4.821% Term Loan, due 2024
Debt Instrument [Line Items]
Par value	300
Total	300
NV Energy \| NPC \| Subsidiary debt
Debt Instrument [Line Items]
Par value	3,234
Total	$ 3,234
NV Energy \| NPC \| Subsidiary debt \| 3.700% Series CC, due 2029
Debt Instrument [Line Items]
Stated rate	3.70%	3.70%
Total long-term debt	$ 497	$ 497
NV Energy \| NPC \| Subsidiary debt \| 2.400% Series DD, due 2030
Debt Instrument [Line Items]
Stated rate	2.40%	2.40%
Total long-term debt	$ 422	$ 422
NV Energy \| NPC \| Subsidiary debt \| 6.650% Series N, due 2036
Debt Instrument [Line Items]
Stated rate	6.65%	6.65%
Total long-term debt	$ 360	$ 359
NV Energy \| NPC \| Subsidiary debt \| 6.750% Series R, due 2037
Debt Instrument [Line Items]
Stated rate	6.75%	6.75%
Total long-term debt	$ 346	$ 346
NV Energy \| NPC \| Subsidiary debt \| 5.375% Series X, due 2040
Debt Instrument [Line Items]
Stated rate	5.375%	5.375%
Total long-term debt	$ 248	$ 248
NV Energy \| NPC \| Subsidiary debt \| 5.450% Series Y, due 2041
Debt Instrument [Line Items]
Stated rate	5.45%	5.45%
Total long-term debt	$ 239	$ 239
NV Energy \| NPC \| Subsidiary debt \| 3.125% Series EE, due 2050
Debt Instrument [Line Items]
Stated rate	3.125%	3.125%
Total long-term debt	$ 298	$ 297
NV Energy \| NPC \| Subsidiary debt \| 5.900% Series GG, due 2053
Debt Instrument [Line Items]
Stated rate		5.90%
Total long-term debt	$ 394	$ 0
NV Energy \| NPC \| Subsidiary debt \| 1.875% Pollution Control Bonds Series 2017A, due 2032
Debt Instrument [Line Items]
Stated rate	1.875%	1.875%
Total long-term debt	$ 39	$ 39
NV Energy \| NPC \| Subsidiary debt \| 1.650% Pollution Control Bonds Series 2017, due 2036
Debt Instrument [Line Items]
Stated rate	1.65%	1.65%
Total long-term debt	$ 39	$ 39
NV Energy \| NPC \| Subsidiary debt \| 1.650% Pollution Control Bonds Series 2017B, due 2039
Debt Instrument [Line Items]
Stated rate	1.65%	1.65%
Total long-term debt	$ 13	$ 13
NV Energy \| NPC \| Subsidiary debt \| Variable-rate 4.821% Term Loan, due 2024
Debt Instrument [Line Items]
Stated rate	4.821%	4.821%
Total long-term debt	$ 300	$ 0

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