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Employee Retirement Benefits
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [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) 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,
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(millions)
Service cost
$
16

 
$
17

 
$
—

 
$
1

 
$
47

 
$
53

 
$
1

 
$
2

Interest cost
26

 
23

 
3

 
3

 
78

 
72

 
10

 
10

Expected return on plan assets
(65
)
 
(63
)
 
—

 
—

 
(195
)
 
(190
)
 
—

 
(1
)
Amortization of prior service (benefit) cost
—

 
—

 
—

 
(1
)
 
1

 
1

 
(2
)
 
(2
)
Amortization of losses
—

 
—

 
—

 
1

 
—

 
—

 
—

 
2

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

 
$
4

 
$
(69
)
 
$
(64
)
 
$
9

 
$
11

Net periodic (income) cost at FPL
$
(15
)
 
$
(14
)
 
$
2

 
$
3

 
$
(44
)
 
$
(41
)
 
$
7

 
$
8