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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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
 
Three Months Ended 
 March 31,
 
Three Months Ended 
 March 31,
 
2015
 
2014
 
2015
 
2014
 
(millions)
Service cost
$
18

 
$
16

 
$
1

 
$
1

Interest cost
24

 
25

 
3

 
4

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

 
—

Amortization of prior service cost (benefit)
—

 
1

 
—

 
(1
)
Net periodic benefit (income) cost at NEE
$
(21
)
 
$
(18
)
 
$
4

 
$
4

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

 
$
3