Long-term Debt - SPPC (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
Current portion of long-term debt	3,201	1,265
Maturity Schedule
2023	3,201
2026	1,430
2028 and thereafter	40,480
Total	51,702
Total long-term debt	51,635	49,762
Subsidiary debt
Debt Instrument [Line Items]
Par value	37,501
Maturity Schedule
Total	37,501
SPPC
Debt Instrument [Line Items]
Par value	1,152
Total long-term debt	1,148	1,164
Current portion of long-term debt	250	0
Long-term debt	898	1,164
Maturity Schedule
Total	1,152
Total long-term debt	1,148	$ 1,164
SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Total long-term debt	1,148
Maturity Schedule
2023	250
2026	400
2028 and thereafter	502
Unamortized discount and debt issuance costs	(4)
Total long-term debt	1,148
NV Energy \| Subsidiary debt
Debt Instrument [Line Items]
Par value	4,386
Maturity Schedule
2023	250
2026	400
2028 and thereafter	3,436
Total	4,386
NV Energy \| SPPC \| 3.375% Series T, due 2023
Debt Instrument [Line Items]
Par value	250
Maturity Schedule
Total	250
NV Energy \| SPPC \| 2.600% Series U, due 2026
Debt Instrument [Line Items]
Par value	400
Maturity Schedule
Total	400
NV Energy \| SPPC \| 6.750% Series P, due 2037
Debt Instrument [Line Items]
Par value	252
Maturity Schedule
Total	252
NV Energy \| SPPC \| 4.710% Series W, due 2052
Debt Instrument [Line Items]
Par value	250
Maturity Schedule
Total	250
NV Energy \| SPPC \| 1.850% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| 3.000% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| 0.625% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| 2.050% Water Facilities Series 2016D, due 2036
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| 2.050% Water Facilities Series 2016E, due 2036
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| 2.050% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| 1.850% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Par value	0
Maturity Schedule
Total	0
NV Energy \| SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Par value	1,152
Maturity Schedule
Total	$ 1,152
NV Energy \| SPPC \| Subsidiary debt \| 3.375% Series T, due 2023
Debt Instrument [Line Items]
Stated rate	3.375%	3.375%
Total long-term debt	$ 249	$ 249
Maturity Schedule
Total long-term debt	$ 249	$ 249
NV Energy \| SPPC \| Subsidiary debt \| 2.600% Series U, due 2026
Debt Instrument [Line Items]
Stated rate	2.60%	2.60%
Total long-term debt	$ 397	$ 397
Maturity Schedule
Total long-term debt	$ 397	$ 397
NV Energy \| SPPC \| Subsidiary debt \| 6.750% Series P, due 2037
Debt Instrument [Line Items]
Stated rate	6.75%	6.75%
Total long-term debt	$ 254	$ 253
Maturity Schedule
Total long-term debt	$ 254	$ 253
NV Energy \| SPPC \| Subsidiary debt \| 4.710% Series W, due 2052
Debt Instrument [Line Items]
Stated rate	4.71%	4.71%
Total long-term debt	$ 248	$ 0
Maturity Schedule
Total long-term debt	$ 248	$ 0
NV Energy \| SPPC \| Subsidiary debt \| 1.850% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Stated rate	1.85%	1.85%
Total long-term debt	$ 0	$ 30
Maturity Schedule
Total long-term debt	$ 0	$ 30
NV Energy \| SPPC \| Subsidiary debt \| 3.000% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Stated rate	3.00%	3.00%
Total long-term debt	$ 0	$ 60
Maturity Schedule
Total long-term debt	$ 0	$ 60
NV Energy \| SPPC \| Subsidiary debt \| 0.625% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Stated rate	0.625%	0.625%
Total long-term debt	$ 0	$ 30
Maturity Schedule
Total long-term debt	$ 0	$ 30
NV Energy \| SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016D, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%	2.05%
Total long-term debt	$ 0	$ 25
Maturity Schedule
Total long-term debt	$ 0	$ 25
NV Energy \| SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016E, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%	2.05%
Total long-term debt	$ 0	$ 25
Maturity Schedule
Total long-term debt	$ 0	$ 25
NV Energy \| SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%	2.05%
Total long-term debt	$ 0	$ 75
Maturity Schedule
Total long-term debt	$ 0	$ 75
NV Energy \| SPPC \| Subsidiary debt \| 1.850% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Stated rate	1.85%	1.85%
Total long-term debt	$ 0	$ 20
Maturity Schedule
Total long-term debt	0	$ 20
SPPC
Maturity Schedule
Eligible property subject to lien of mortgages	4,900
SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Par value	1,152
Maturity Schedule
Total	$ 1,152
SPPC \| Subsidiary debt \| 3.375% Series T, due 2023
Debt Instrument [Line Items]
Stated rate	3.375%
Par value	$ 250
Maturity Schedule
Total	$ 250
SPPC \| Subsidiary debt \| 2.600% Series U, due 2026
Debt Instrument [Line Items]
Stated rate	2.60%
Par value	$ 400
Maturity Schedule
Total	$ 400
SPPC \| Subsidiary debt \| 6.750% Series P, due 2037
Debt Instrument [Line Items]
Stated rate	6.75%
Par value	$ 252
Maturity Schedule
Total	$ 252
SPPC \| Subsidiary debt \| 4.710% Series W, due 2052
Debt Instrument [Line Items]
Stated rate	4.71%
Par value	$ 250
Maturity Schedule
Total	$ 250
SPPC \| Subsidiary debt \| 1.850% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Stated rate	1.85%
Par value	$ 0
Maturity Schedule
Total	$ 0
SPPC \| Subsidiary debt \| 3.000% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Stated rate	3.00%
Par value	$ 0
Maturity Schedule
Total	$ 0
SPPC \| Subsidiary debt \| 0.625% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Stated rate	0.625%
Par value	$ 0
Maturity Schedule
Total	$ 0
SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016D, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%
Par value	$ 0
Maturity Schedule
Total	$ 0
SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016E, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%
Par value	$ 0
Maturity Schedule
Total	$ 0
SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%
Par value	$ 0
Maturity Schedule
Total	$ 0
SPPC \| Subsidiary debt \| 1.850% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Stated rate	1.85%
Par value	$ 0
Maturity Schedule
Total	$ 0

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