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Employee Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2012
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 June 30,
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
Six Months Ended June 30,
 
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
 
 (millions)
Service cost
 
$
16

 
$
16

 
$
1

 
$
2

 
$
33

 
$
32

 
$
3

 
$
3

Interest cost
 
25

 
25

 
5

 
5

 
49

 
49

 
9

 
11

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

 
(1
)
 
(119
)
 
(119
)
 
(1
)
 
(1
)
Amortization of transition obligation
 
—

 
—

 
1

 
1

 
—

 
—

 
1

 
1

Amortization of prior service cost (benefit)
 
1

 
(1
)
 
—

 
—

 
2

 
(1
)
 
1

 
—

Net periodic benefit (income) cost at NEE
 
$
(18
)
 
$
(20
)
 
$
7

 
$
7

 
$
(35
)
 
$
(39
)
 
$
13

 
$
14

Net periodic benefit (income) cost at FPL
 
$
(11
)
 
$
(13
)
 
$
5

 
$
5

 
$
(23
)
 
$
(26
)
 
$
10

 
$
10