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Short-Term Debt and Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Short-term Debt [Abstract] |
Schedule of Line of Credit Facilities [Table Text Block] | The following table provides information regarding the Company's revolving credit agreements at December 31, 2017.
| Aggregate | Amount | Weighted-Average |  |
Entity | Commitment | Outstanding (A) | Interest Rate | Expiration
| (In millions) |  |  |  |
OGE Energy (B) | $ | 450.0 |  | $ | 168.4 |  | 1.62 | % | (D) | March 8, 2022 |
OG&E (C) | 450.0 |  | 0.3 |  | 0.95 | % | (D) | March 8, 2022 |
Total | $ | 900.0 |  | $ | 168.7 |  | 1.62 | % |  |  |
(A) | Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2017.
(B) | This bank facility is available to back up the Company's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
(C) | This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
(D) | Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to 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. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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