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Retirement Plans and Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following tables present the net periodic benefit cost components, before consideration of capitalized amounts, of OGE Energy's Pension Plan, Restoration of Retirement Income Plan and postretirement benefit plans that are included in the condensed financial statements. Service cost is presented within Other Operation and Maintenance Expense, and the remaining net periodic benefit cost components as listed in the following tables are presented within Other Net Periodic Benefit Expense in the statements of income. OG&E recovers specific amounts of pension and postretirement medical costs in rates approved in its Oklahoma rate reviews. In accordance with approved orders, OG&E defers the difference between actual pension and postretirement medical expenses and the amount approved in its last Oklahoma rate review as a regulatory asset or regulatory liability. These amounts have been recorded in the Pension tracker in the regulatory assets and liabilities table in Note 1 and within Other Net Periodic Benefit Expense in the statements of income.
| Pension Plan |  | Restoration of Retirement Income Plan
| Three Months Ended | Nine Months Ended |  | Three Months Ended | Nine Months Ended
OGE Energy | September 30, | September 30, |  | September 30, | September 30,
(In millions) | 2021 | 2020 | 2021 | 2020 |  | 2021 | 2020 | 2021 | 2020
Service cost | $ | 2.8 |  | $ | 3.3 |  | $ | 8.4 |  | $ | 9.8 |  |  | $ | 0.3 |  | $ | 0.2 |  | $ | 0.6 |  | $ | 0.6 |
Interest cost | 3.1 |  | 4.2 |  | 10.0 |  | 13.4 |  |  | — |  | 0.1 |  | 0.1 |  | 0.2 |
Expected return on plan assets | (8.5) |  | (9.4) |  | (25.6) |  | (28.0) |  |  | — |  | — |  | — |  | — |
Amortization of net loss | 2.3 |  | 4.3 |  | 7.0 |  | 12.7 |  |  | — |  | 0.1 |  | 0.1 |  | 0.4 |
Amortization of unrecognized prior service cost (A) | — |  | — |  | — |  | — |  |  | 0.1 |  | — |  | 0.1 |  | — |
Settlement cost | 3.7 |  | 12.1 |  | 35.4 |  | 12.1 |  |  | 1.7 |  | 0.4 |  | 2.1 |  | 0.7 |
Total net periodic benefit cost | 3.4 |  | 14.5 |  | 35.2 |  | 20.0 |  |  | 2.1 |  | 0.8 |  | 3.0 |  | 1.9 |
Less: Amount paid by unconsolidated affiliates (B) | (0.1) |  | 0.5 |  | (0.2) |  | 1.6 |  |  | — |  | 0.1 |  | — |  | 0.1 |
Net periodic benefit cost | $ | 3.5 |  | $ | 14.0 |  | $ | 35.4 |  | $ | 18.4 |  |  | $ | 2.1 |  | $ | 0.7 |  | $ | 3.0 |  | $ | 1.8 |
| Pension Plan |  | Restoration of Retirement Income Plan
| Three Months Ended | Nine Months Ended |  | Three Months Ended | Nine Months Ended
OG&E | September 30, | September 30, |  | September 30, | September 30,
(In millions) | 2021 | 2020 | 2021 | 2020 |  | 2021 | 2020 | 2021 | 2020
Service cost | $ | 2.0 |  | $ | 2.3 |  | $ | 5.8 |  | $ | 6.8 |  |  | $ | — |  | $ | — |  | $ | — |  | $ | 0.1 |
Interest cost | 2.3 |  | 3.2 |  | 7.3 |  | 10.0 |  |  | — |  | — |  | — |  | 0.1 |
Expected return on plan assets | (6.2) |  | (7.0) |  | (18.5) |  | (20.9) |  |  | — |  | — |  | — |  | — |
Amortization of net loss | 1.7 |  | 3.0 |  | 5.2 |  | 9.0 |  |  | — |  | 0.1 |  | 0.1 |  | 0.3 |
Settlement cost | 2.6 |  | 10.3 |  | 29.2 |  | 10.3 |  |  | 1.3 |  | 0.5 |  | 1.6 |  | 0.5 |
Total net periodic benefit cost | 2.4 |  | 11.8 |  | 29.0 |  | 15.2 |  |  | 1.3 |  | 0.6 |  | 1.7 |  | 1.0 |
Plus: Amount allocated from OGE Energy (B) | 0.7 |  | 1.5 |  | 5.3 |  | 2.5 |  |  | 0.8 |  | 0.2 |  | 1.3 |  | 0.8 |
Net periodic benefit cost | $ | 3.1 |  | $ | 13.3 |  | $ | 34.3 |  | $ | 17.7 |  |  | $ | 2.1 |  | $ | 0.8 |  | $ | 3.0 |  | $ | 1.8 |
(A) Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment. (B) "Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E. In addition to the net periodic benefit cost amounts recognized, as presented in the tables above, for the Pension and Restoration of Retirement Income Plans for the three and nine months ended September 30, 2021 and 2020, the Registrants recognized the following:
| Three Months Ended September 30, | Nine Months Ended September 30,
(In millions) | 2021 | 2020 | 2021 | 2020
Increase of pension expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | $ | 3.9 |  | $ | 2.4 |  | $ | 11.1 |  | $ | 5.7 |
Deferral of pension expense related to pension settlement charges: |  |  |  |
Oklahoma jurisdiction (A) | $ | 4.4 |  | $ | 10.8 |  | $ | 33.3 |  | $ | 11.1 |
Arkansas jurisdiction (A) | $ | 0.4 |  | $ | 1.0 |  | $ | 3.1 |  | $ | 1.0 |
(A) Included in the pension regulatory asset or liability in each jurisdiction, as indicated in the regulatory assets and liabilities table in Note 1.
| OGE Energy |  | OG&E
| Postretirement Benefit Plans |  | Postretirement Benefit Plans
| Three Months Ended | Nine Months Ended |  | Three Months Ended | Nine Months Ended
| September 30, | September 30, |  | September 30, | September 30,
(In millions) | 2021 | 2020 | 2021 | 2020 |  | 2021 | 2020 | 2021 | 2020
Service cost | $ | 0.1 |  | $ | 0.1 |  | $ | 0.2 |  | $ | 0.2 |  |  | $ | — |  | $ | — |  | $ | 0.1 |  | $ | 0.1 |
Interest cost | 0.9 |  | 1.0 |  | 2.6 |  | 3.1 |  |  | 0.6 |  | 0.8 |  | 1.9 |  | 2.4 |
Expected return on plan assets | (0.4) |  | (0.5) |  | (1.4) |  | (1.4) |  |  | (0.4) |  | (0.4) |  | (1.3) |  | (1.2) |
Amortization of net loss | 0.7 |  | 0.5 |  | 2.1 |  | 1.5 |  |  | 0.6 |  | 0.5 |  | 2.0 |  | 1.6 |
Amortization of unrecognized prior service cost (A) | (1.8) |  | (2.1) |  | (5.2) |  | (6.3) |  |  | (1.2) |  | (1.5) |  | (3.7) |  | (4.6) |
Total net periodic benefit cost | (0.5) |  | (1.0) |  | (1.7) |  | (2.9) |  |  | (0.4) |  | (0.6) |  | (1.0) |  | (1.7) |
Less: Amount paid by unconsolidated affiliates (B) | (0.1) |  | (0.2) |  | (0.4) |  | (0.6) |  |  |  |  |  |
Plus: Amount allocated from OGE Energy (B) |  |  |  |  |  | (0.1) |  | (0.2) |  | (0.3) |  | (0.6) |
Net periodic benefit cost | $ | (0.4) |  | $ | (0.8) |  | $ | (1.3) |  | $ | (2.3) |  |  | $ | (0.5) |  | $ | (0.8) |  | $ | (1.3) |  | $ | (2.3) |
(A)Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment. (B)"Amount paid by unconsolidated affiliates" is only applicable to OGE Energy. "Amount allocated from OGE Energy" is only applicable to OG&E. In addition to the net periodic benefit income amounts recognized, as presented in the table above, for the postretirement benefit plans for the three and nine months ended September 30, 2021 and 2020, the Registrants recognized the following:
| Three Months Ended September 30, | Nine Months Ended September 30,
(In millions) | 2021 | 2020 | 2021 | 2020
Increase of postretirement expense to maintain allowed recoverable amount in Oklahoma jurisdiction (A) | $ | 0.1 |  | $ | 0.4 |  | $ | 0.3 |  | $ | 1.2 |
(A) Included in the Pension tracker, as presented in the regulatory assets and liabilities table in Note 1.
Schedule of Capitalized Pension and Postretirement Cost [Table Text Block] |
| OGE Energy |  | OG&E
| Three Months Ended | Nine Months Ended |  | Three Months Ended | Nine Months Ended
| September 30, | September 30, |  | September 30, | September 30,
(In millions) | 2021 | 2020 | 2021 | 2020 |  | 2021 | 2020 | 2021 | 2020
Capitalized portion of net periodic pension benefit cost | $ | 0.9 |  | $ | 0.9 |  | $ | 2.5 |  | $ | 2.7 |  |  | $ | 0.7 |  | $ | 0.8 |  | $ | 2.1 |  | $ | 2.3 |
Capitalized portion of net periodic postretirement benefit cost | $ | 0.1 |  | $ | — |  | $ | 0.2 |  | $ | 0.1 |  |  | $ | — |  | $ | — |  | $ | 0.1 |  | $ | 0.1 |

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