Regulatory Matters - SPPC - Narrative (Details) - SPPC - PUNC - Subsequent event $ in Millions	1 Months Ended
	Feb. 23, 2024 USD ($)
Electric
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 95
Requested rate increase (decrease), percentage	8.80%
Natural gas
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 11
Requested rate increase (decrease), percentage	4.90%