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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Net periodic benefit (income) cost
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,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(millions)
Service cost
$
20

 
$
18

 
$
—

 
$
—

 
$
60

 
$
52

 
$
1

 
$
1

Interest cost
28

 
20

 
3

 
2

 
86

 
62

 
7

 
5

Expected return on plan assets
(78
)
 
(69
)
 
—

 
—

 
(235
)
 
(207
)
 
—

 
—

Amortization of prior service benefit
—

 
—

 
(4
)
 
(4
)
 
(1
)
 
(1
)
 
(12
)
 
(12
)
Special termination benefits(a)
1

 
14

 
—

 
—

 
17

 
14

 
—

 
—

Net periodic income at NEE
$
(29
)
 
$
(17
)
 
$
(1
)
 
$
(2
)
 
$
(73
)
 
$
(80
)
 
$
(4
)
 
$
(6
)
Net periodic income allocated to FPL
$
(18
)
 
$
(11
)
 
$
(1
)
 
$
(2
)
 
$
(53
)
 
$
(51
)
 
$
(3
)
 
$
(4
)