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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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
 
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
 
2013
 
2012
 
2013
 
2012
 
 
 (millions)
Service cost
 
$
18

 
$
16

 
$
1

 
$
1

Interest cost
 
24

 
25

 
4

 
5

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

 
—

Amortization of transition obligation
 
—

 
—

 
—

 
1

Amortization of prior service cost (benefit)
 
2

 
1

 
(1
)
 
—

Amortization of losses
 
1

 
—

 
1

 
—

Net periodic benefit (income) cost at NEE
 
$
(15
)
 
$
(18
)
 
$
5

 
$
7

Net periodic benefit (income) cost at FPL
 
$
(10
)
 
$
(11
)
 
$
3

 
$
5