Long-term Debt - SPPC (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Par value	$ 49,746
Long-term debt	49,762	$ 49,866
Maturity Schedule
2023	3,225
2026	1,474
2027 and thereafter	38,506
Total	49,746
Total long-term debt	49,762	49,866
Subsidiary debt
Debt Instrument [Line Items]
Par value	36,545
Maturity Schedule
Total	36,545
SPPC
Debt Instrument [Line Items]
Par value	1,167
Long-term debt	1,164	1,164
Long-term debt	1,164	1,164
Maturity Schedule
Total	1,167
Total long-term debt	1,164	$ 1,164
SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Long-term debt	1,164
Maturity Schedule
2023	250
2026	400
2027 and thereafter	517
Unamortized discount and debt issuance costs	(3)
Total long-term debt	1,164
NV Energy \| Subsidiary debt
Debt Instrument [Line Items]
Par value	3,701
Maturity Schedule
2023	250
2026	400
2027 and thereafter	3,051
Total	3,701
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 \| 1.850% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Par value	30
Maturity Schedule
Total	30
NV Energy \| SPPC \| 3.000% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Par value	60
Maturity Schedule
Total	60
NV Energy \| SPPC \| 0.625% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Par value	30
Maturity Schedule
Total	30
NV Energy \| SPPC \| 2.050% Water Facilities Series 2016D, due 2036
Debt Instrument [Line Items]
Par value	25
Maturity Schedule
Total	25
NV Energy \| SPPC \| 2.050% Water Facilities Series 2016E, due 2036
Debt Instrument [Line Items]
Par value	25
Maturity Schedule
Total	25
NV Energy \| SPPC \| 2.050% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Par value	75
Maturity Schedule
Total	75
NV Energy \| SPPC \| 1.850% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Par value	20
Maturity Schedule
Total	20
NV Energy \| SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Par value	1,167
Maturity Schedule
Total	$ 1,167
NV Energy \| SPPC \| Subsidiary debt \| 3.375% Series T, due 2023
Debt Instrument [Line Items]
Stated rate	3.375%	3.375%
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%
Long-term debt	$ 397	$ 396
Maturity Schedule
Total long-term debt	$ 397	$ 396
NV Energy \| SPPC \| Subsidiary debt \| 6.750% Series P, due 2037
Debt Instrument [Line Items]
Stated rate	6.75%	6.75%
Long-term debt	$ 253	$ 255
Maturity Schedule
Total long-term debt	$ 253	$ 255
NV Energy \| SPPC \| Subsidiary debt \| 1.850% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Stated rate	1.85%	1.85%
Long-term debt	$ 30	$ 29
Maturity Schedule
Total long-term debt	$ 30	$ 29
NV Energy \| SPPC \| Subsidiary debt \| 3.000% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Stated rate	3.00%	3.00%
Long-term debt	$ 60	$ 61
Maturity Schedule
Total long-term debt	$ 60	$ 61
NV Energy \| SPPC \| Subsidiary debt \| 0.625% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Stated rate	0.625%	0.625%
Long-term debt	$ 30	$ 30
Maturity Schedule
Total long-term debt	$ 30	$ 30
NV Energy \| SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016D, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%	2.05%
Long-term debt	$ 25	$ 25
Maturity Schedule
Total long-term debt	$ 25	$ 25
NV Energy \| SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016E, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%	2.05%
Long-term debt	$ 25	$ 25
Maturity Schedule
Total long-term debt	$ 25	$ 25
NV Energy \| SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%	2.05%
Long-term debt	$ 75	$ 74
Maturity Schedule
Total long-term debt	$ 75	$ 74
NV Energy \| SPPC \| Subsidiary debt \| 1.850% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Stated rate	1.85%	1.85%
Long-term debt	$ 20	$ 20
Maturity Schedule
Total long-term debt	20	$ 20
SPPC
Maturity Schedule
Eligible property subject to lien of mortgages	4,500
SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Par value	1,167
Maturity Schedule
Total	$ 1,167
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 \| 1.850% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Stated rate	1.85%
Par value	$ 30
Maturity Schedule
Total	$ 30
SPPC \| Subsidiary debt \| 3.000% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Stated rate	3.00%
Par value	$ 60
Maturity Schedule
Total	$ 60
SPPC \| Subsidiary debt \| 0.625% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Stated rate	0.625%
Par value	$ 30
Maturity Schedule
Total	$ 30
SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016D, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%
Par value	$ 25
Maturity Schedule
Total	$ 25
SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016E, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%
Par value	$ 25
Maturity Schedule
Total	$ 25
SPPC \| Subsidiary debt \| 2.050% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Stated rate	2.05%
Par value	$ 75
Maturity Schedule
Total	$ 75
SPPC \| Subsidiary debt \| 1.850% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Stated rate	1.85%
Par value	$ 20
Maturity Schedule
Total	$ 20

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