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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2013
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,
 
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
 
(millions)
Service cost
 
$
19

 
$
16

 
$
1

 
$
1

 
$
55

 
$
49

 
$
3

 
$
4

Interest cost
 
23

 
25

 
3

 
4

 
71

 
74

 
11

 
13

Expected return on plan assets
 
(59
)
 
(60
)
 
(1
)
 
—

 
(178
)
 
(179
)
 
(1
)
 
(1
)
Amortization of transition obligation
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
1

Amortization of prior service cost (benefit)
 
2

 
1

 
—

 
(1
)
 
6

 
3

 
(2
)
 
—

Amortization of losses
 
—

 
—

 
1

 
—

 
1

 
—

 
2

 
—

Special termination benefits
 
15

 
—

 
—

 
—

 
27

 
—

 
—

 
—

Net periodic benefit (income) cost at NEE
 
$
—

 
$
(18
)
 
$
4

 
$
4

 
$
(18
)
 
$
(53
)
 
$
13

 
$
17

Net periodic benefit (income) cost at FPL
 
$
2

 
$
(11
)
 
$
3

 
$
3

 
$
(10
)
 
$
(34
)
 
$
9

 
$
13