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Employee Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Net periodic benefit (income) cost | The components of net periodic benefit (income) cost 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,
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
| (millions)
Service cost | $ | 18 |  |  | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | 52 |  |  | $ | 49 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 20 |  |  | 21 |  |  | 2 |  |  | 2 |  |  | 62 |  |  | 63 |  |  | 5 |  |  | 6 |
Expected return on plan assets | (69 | ) |  | (67 | ) |  | — |  |  | — |  |  | (207 | ) |  | (202 | ) |  | — |  |  | — |
Amortization of prior service benefit | — |  |  | — |  |  | (4 | ) |  | (4 | ) |  | (1 | ) |  | (1 | ) |  | (12 | ) |  | (6 | )
Special termination benefits(a) | 14 |  |  | — |  |  | — |  |  | — |  |  | 14 |  |  | 38 |  |  | — |  |  | — |
Postretirement benefits settlement | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net periodic benefit (income) cost at NEE | $ | (17 | ) |  | $ | (30 | ) |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | (80 | ) |  | $ | (53 | ) |  | $ | (6 | ) |  | $ | 2 |
Net periodic benefit (income) cost at FPL | $ | (11 | ) |  | $ | (20 | ) |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | (51 | ) |  | $ | (32 | ) |  | $ | (4 | ) |  | $ | 1 |
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(a) | Reflects enhanced early retirement programs.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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