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Employee Retirement Benefits
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [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 for the plans are as follows:
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2019
 
2018
 
2019
 
2018
 
(millions)
Service cost
$
20

 
$
18

 
$
—

 
$
—

Interest cost
29

 
20

 
3

 
2

Expected return on plan assets
(79
)
 
(69
)
 
—

 
—

Amortization of prior service benefit
—

 
—

 
(4
)
 
(4
)
Net periodic income at NEE
$
(30
)
 
$
(31
)
 
$
(1
)
 
$
(2
)
Net periodic income allocated to FPL
$
(18
)
 
$
(20
)
 
$
(1
)
 
$
(2
)