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Rate Matters and Regulation - Additional Information (Details) - USD ($) $ in Millions	May 15, 2025	Jun. 12, 2024	Sep. 30, 2025
CWIP incentive and abandoned plant incentive cost	$ 250.0
Estimated Refund to SPP			$ 14.0
OKLAHOMA [Member]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 126.7
Impact to Company [Member]
Estimated Refund to SPP			4.0
Customer Impact [Member]
Estimated Refund to SPP			$ 10.0

X

- Definition

Construction work in progress incentive and abandonment incentive cost.

+ References

No definition available.

+ Details

Name:	oge_ConstructionWorkInProgressIncentiveAndAbandonmentIncentiveCost
Namespace Prefix:	oge_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Estimated Refund to SPP

+ References

No definition available.

+ Details

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Namespace Prefix:	oge_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	dei_EntityByLocationAxis=stpr_OK
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	oge_EstimatedRefundtoSPPAxis=oge_ImpacttoCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	oge_EstimatedRefundtoSPPAxis=oge_CustomerImpactMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: