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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost (Credit)
The components of net periodic benefit cost for our retirement plans and postretirement plans for the periods ended September 30 are as follows: 
(in millions)
Three Months
 
Nine Months
 
2018
 
2017
 
2018
 
2017
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
18

 
19

 
54

 
56

Expected return on assets
(31
)
 
(32
)
 
(94
)
 
(95
)
Amortization of prior service credit / actuarial loss
4

 
4

 
13

 
12

Net periodic benefit cost
$
(8
)
 
$
(8
)
 
$
(25
)
 
$
(25
)