CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - PSO (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Cash Flow Hedges, Tax	$ (4)	$ 6
PUBLIC SERVICE COMPANY OF OKLAHOMA
Cash Flow Hedges, Tax	$ 0	$ 0

Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration