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Employee Retirement Benefits
 3 Months Ended
Mar. 31, 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. NEE also has a supplemental executive retirement plan, which includes a non-qualified supplemental defined benefit pension component that provides benefits to a select group of management and highly compensated employees, 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
 
Three Months Ended 
 March 31,
 
Three Months Ended 
 March 31,
 
2016
 
2015
 
2016
 
2015
 
(millions)
Service cost
$
16

 
$
18

 
$
1

 
$
1

Interest cost
26

 
24

 
3

 
3

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

 
—

Amortization of prior service benefit
—

 
—

 
(1
)
 
—

Net periodic (income) cost at NEE
$
(23
)
 
$
(21
)
 
$
3

 
$
4

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

 
$
3