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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Compensation and Retirement Disclosure [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 three months ended March 31 are as follows: 
(in millions)
2018
 
2017
Service cost
$
1

 
$
1

Interest cost
18

 
18

Expected return on assets
(32
)
 
(31
)
Amortization of actuarial loss
4

 
4

Net periodic benefit cost
$
(9
)
 
$
(8
)