XML 66 R47.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies Depreciation and Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Provision for Depreciation Rate | 2.50% | 3.00%
Projected provision for depreciation in next fiscal year | 2.70% |
Percent Of Intangible Plant Balance Amortizable | 98.60% |
Percent of Intangible Plant Balance Amortizable Thereafter | 1.40% |
Transmission Equipment [Member] | OG&E [Member] |  |
Amount of Acquisition Adjustments | $ 3.3 |
Redbud Plant [Member] |  |
Amount of Acquisition Adjustments | $ 148.3 | $ 148.3

X
- Definition Percent Of Intangible Plant Balance Amortizable + References No definition available. + Details
Name: | oge_PercentOfIntangiblePlantBalanceAmortizable
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent of Intangible Plant Balance Amortizable Thereafter + References No definition available. + Details
Name: | oge_PercentOfIntangiblePlantBalanceAmortizableThereafter
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Projected provision for depreciation in next fiscal year + References No definition available. + Details
Name: | oge_Projectedprovisionfordepreciationinnextfiscalyear
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Provision for Depreciation Rate + References No definition available. + Details
Name: | oge_ProvisionForDepreciationRate
Namespace Prefix: | oge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=oge_TransmissionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=oge_RedbudPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |