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Short-Term Debt and Credit Facilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Line of Credit Facility [Line Items] |  |  |
Short-term debt |  | $ 168.4 | $ 236.2
Line of Credit Facility [Abstract] |  |  |
Aggregate Commitment |  | 900.0 |
Amount Outstanding | [1] | $ 168.7 |
Weighted Average Interest Rate |  | 1.62% |
Maturity |  | Mar. 08, 2022 |
Ratio of Consolidated Debt to Consolidated Capitalization |  | 65.00% |
OGE Energy [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 450.0 |
Line of Credit Facility [Abstract] |  |  |
Amount Outstanding |  | $ 168.4 |
Weighted Average Interest Rate |  | 1.62% |
Maturity |  | Mar. 08, 2022 |
Ratio of Consolidated Debt to Consolidated Capitalization |  | 65.00% |
OG&E [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 450.0 |
Line of Credit Facility [Abstract] |  |  |
Aggregate Commitment |  | 600.0 |
Letters of Credit Outstanding, Amount |  | $ 0.3 |
Weighted Average Interest Rate |  | 0.95% |
Maturity |  | Mar. 08, 2022 |
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt |  | 2 years |
Short Term Borrowing Capacity That Has Regulatory Approval |  | $ 800.0 |
Debt Restriction Maximum Letters of Credit |  | 100.0 |
Available Optional Increase of Borrowing Capacity in Credit Facility |  | $ 150.0 |
Ratio of Consolidated Debt to Consolidated Capitalization |  | 65.00% |
Uninsured Judgements [Member] | OGE Energy [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Acceleration of Indebtedness of Credit Facility |  | $ 100.0 |
Uninsured Judgements [Member] | OG&E [Member] |  |  |
Line of Credit Facility [Abstract] |  |  |
Acceleration of Indebtedness of Credit Facility |  | $ 100.0 |
[1] | Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2017.

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- Definition Acceleration of Indebtedness of Credit Facility + References No definition available. + Details
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- Definition Available Optional Increase of Borrowing Capacity in Credit Facility + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Debt Restriction Maximum Letters of Credit + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt + References No definition available. + Details
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- Definition The percentage of consolidated debt to total consolidated capitalization, which the entity may not exceed pursuant to a debt covenant. + References No definition available. + Details
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- Definition Short Term Borrowing Capacity That Has Regulatory Approval + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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