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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Net periodic benefit (income) cost
The components of net periodic benefit (income) cost for the plans are as follows:
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
 
Three Months Ended 
 September 30,
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(millions)
Service cost
$
18

 
$
15

 
$
1

 
$
—

 
$
54

 
$
47

 
$
2

 
$
2

Interest cost
24

 
25

 
3

 
4

 
73

 
76

 
10

 
12

Expected return on plan assets
(63
)
 
(60
)
 
—

 
—

 
(190
)
 
(180
)
 
(1
)
 
(1
)
Amortization of prior service cost (benefit)
—

 
3

 
(1
)
 
(1
)
 
1

 
4

 
(2
)
 
(2
)
Amortization of losses
—

 
—

 
1

 
—

 
—

 
—

 
2

 
—

Net periodic benefit (income) cost at NEE
$
(21
)
 
$
(17
)
 
$
4

 
$
3

 
$
(62
)
 
$
(53
)
 
$
11

 
$
11

Net periodic benefit (income) cost at FPL
$
(13
)
 
$
(11
)
 
$
3

 
$
2

 
$
(40
)
 
$
(34
)
 
$
8

 
$
8