Employee Benefit Plans - SPPC (Details) - SPPC - U.S. - NV Energy - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other Current Liabilities | Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other current liabilities	$ (1)	$ (1)
Other Noncurrent Liabilities | Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other long-term liabilities	(5)	(5)
Other Noncurrent Liabilities | Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Other long-term liabilities	(2)	(2)
Qualified Plan | Other Assets | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other non-current assets	$ 44	$ 43