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v3.20.1

Rate Matters and Regulation Rate Matters and Regulation (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($)
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 5.2
Estimated Refund to SPP | 13.0
Investment in Grid Enhancement | 800.0
Impact to Company [Member] |
Estimated Refund to SPP | 5.0
Customer Impact [Member] |
Estimated Refund to SPP | $ 8.0

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- 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

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- Definition Investment in Grid Enhancement + References No definition available. + Details
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Namespace Prefix: | oge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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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: |