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Employee Retirement Benefits | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Employee Retirement Benefits | Employee Retirement Benefits NEE sponsors a qualified noncontributory defined benefit pension plan for substantially all employees of NEE and its subsidiaries and sponsors a contributory postretirement plan for other benefits for retirees of NEE and its subsidiaries meeting certain eligibility requirements. The components of net periodic income for the plans are as follows:
| Pension Benefits |  | Postretirement Benefits |  | Pension Benefits |  | Postretirement Benefits
| Three Months Ended September 30, |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
| (millions)
Service cost | $ | 22 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 64 |  |  | $ | 60 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 23 |  |  | 28 |  |  | 3 |  |  | 3 |  |  | 69 |  |  | 86 |  |  | 6 |  |  | 7 |
Expected return on plan assets | (80 | ) |  | (78 | ) |  | — |  |  | — |  |  | (241 | ) |  | (235 | ) |  | — |  |  | — |
Amortization of prior service benefit | (1 | ) |  | — |  |  | (4 | ) |  | (4 | ) |  | (1 | ) |  | (1 | ) |  | (12 | ) |  | (12 | )
Amortization of actuarial loss | 4 |  |  | — |  |  | — |  |  | — |  |  | 13 |  |  | — |  |  | 2 |  |  | — |
Special termination benefits(a) | 4 |  |  | 1 |  |  | — |  |  | — |  |  | 13 |  |  | 17 |  |  | — |  |  | — |
Net periodic income at NEE | $ | (28 | ) |  | $ | (29 | ) |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (83 | ) |  | $ | (73 | ) |  | $ | (3 | ) |  | $ | (4 | )
Net periodic income allocated to FPL | $ | (19 | ) |  | $ | (18 | ) |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (58 | ) |  | $ | (53 | ) |  | $ | (2 | ) |  | $ | (3 | )
_________________________ (a) Reflects enhanced early retirement benefits.

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