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Employee Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 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
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended 
 June 30,
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
(millions)
Service cost
$
18

 
$
17

 
$
—

 
$
1

 
$
35

 
$
33

 
$
1

 
$
1

Interest cost
20

 
21

 
2

 
2

 
41

 
42

 
3

 
4

Expected return on plan assets
(69
)
 
(68
)
 
—

 
—

 
(138
)
 
(135
)
 
—

 
—

Amortization of prior service benefit
—

 
(1
)
 
(4
)
 
(2
)
 
—

 
(1
)
 
(8
)
 
(2
)
Special termination benefits
—

 
37

 
—

 
—

 
—

 
38

 
—

 
—

Postretirement benefits settlement
—

 
—

 
—

 
1

 
—

 
—

 
—

 
1

Net periodic benefit (income) cost at NEE
$
(31
)
 
$
6

 
$
(2
)
 
$
2

 
$
(62
)
 
$
(23
)
 
$
(4
)
 
$
4

Net periodic benefit (income) cost at FPL
$
(20
)
 
$
6

 
$
(2
)
 
$
1

 
$
(40
)
 
$
(12
)
 
$
(3
)
 
$
3