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Employee Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [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 
 June 30,
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
(millions)
Service cost
$
15

 
$
18

 
$
—

 
$
—

 
$
31

 
$
36

 
$
1

 
$
1

Interest cost
26

 
25

 
4

 
4

 
52

 
49

 
7

 
7

Expected return on plan assets
(65
)
 
(64
)
 
—

 
(1
)
 
(130
)
 
(127
)
 
—

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

 
1

 
(1
)
 
(1
)
 
1

 
1

 
(2
)
 
(1
)
Amortization of losses
—

 
—

 
—

 
1

 
—

 
—

 
—

 
1

Net periodic (income) cost at NEE
$
(23
)
 
$
(20
)
 
$
3

 
$
3

 
$
(46
)
 
$
(41
)
 
$
6

 
$
7

Net periodic (income) cost at FPL
$
(14
)
 
$
(13
)
 
$
3

 
$
2

 
$
(29
)
 
$
(27
)
 
$
5

 
$
5