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Employee Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net periodic benefit (income) cost
The components of net periodic benefit (income) cost for the plans are as follows:
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended
March 31,
 
Three Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
 
(millions)
Service cost
$
18

 
$
16

 
$
—

 
$
—

Interest cost
20

 
21

 
2

 
2

Expected return on plan assets
(69
)
 
(67
)
 
—

 
—

Amortization of prior service benefit
—

 
—

 
(4
)
 
—

Special termination benefits
—

 
1

 
—

 
—

Net periodic benefit (income) cost at NEE
$
(31
)
 
$
(29
)
 
$
(2
)
 
$
2

Net periodic benefit (income) cost at FPL
$
(20
)
 
$
(18
)
 
$
(2
)
 
$
2