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Summary of Significant Accounting Policies Equity Ownership (Details) | Mar. 31, 2018
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CenterPoint [Member] |
Percentage Share of Management Rights | 50.00%
OGE Energy [Member] |
Percentage Share of Management Rights | 50.00%

X
- Definition Percentage Share of Management Rights + References No definition available. + Details
Name: | oge_PercentageShareOfManagementRights
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=oge_CenterpointMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=oge_OgeEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |