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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Net periodic benefit (income) cost
The components of net periodic (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,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
(millions)
Service cost
$
16

 
$
16

 
$
—

 
$
—

 
$
49

 
$
47

 
$
1

 
$
1

Interest cost
21

 
26

 
2

 
3

 
63

 
78

 
6

 
10

Expected return on plan assets
(67
)
 
(65
)
 
—

 
—

 
(202
)
 
(195
)
 
—

 
—

Amortization of prior service cost (benefit)
—

 
—

 
(4
)
 
—

 
(1
)
 
1

 
(6
)
 
(2
)
Special termination benefits
—

 
—

 
—

 
—

 
38

 
—

 
—

 
—

Postretirement benefits settlement
—

 
—

 
—

 
—

 
—

 
—

 
1

 
—

Net periodic (income) cost at NEE
$
(30
)
 
$
(23
)
 
$
(2
)
 
$
3

 
$
(53
)
 
$
(69
)
 
$
2

 
$
9

Net periodic (income) cost at FPL
$
(20
)
 
$
(15
)
 
$
(2
)
 
$
2

 
$
(32
)
 
$
(44
)
 
$
1

 
$
7