Employee Benefit Plans - SPPC (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 7,000,000	$ 6,000,000
Other assets	183,000,000	104,000,000
Other current liabilities	0	0
Other long-term liabilities	(4,000,000)	(4,000,000)
Other Postretirement | SPPC
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	3,000,000	3,000,000	$ 5,000,000
Other Postretirement | SPPC | Other non-current assets | NV Energy
Defined Benefit Plan Disclosure [Line Items]
Other assets	5,000,000	1,000,000
Qualified Plan | Pension | SPPC
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	0	0	0
Qualified Plan | Pension | SPPC | Other non-current assets | NV Energy
Defined Benefit Plan Disclosure [Line Items]
Other assets	59,000,000	53,000,000
Nonqualified Plan | Other Pension Plan | SPPC
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1,000,000	1,000,000	$ 1,000,000
Nonqualified Plan | Other Pension Plan | SPPC | Other current liabilities | NV Energy
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	(1,000,000)	(1,000,000)
Nonqualified Plan | Other Pension Plan | SPPC | Other long-term liabilities | NV Energy
Defined Benefit Plan Disclosure [Line Items]
Other long-term liabilities	$ (5,000,000)	$ (5,000,000)