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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit (credit) cost for our retirement plans and postretirement plans
The components of net periodic benefit (credit) cost for our retirement plans and postretirement plans for the three months ended March 31 are as follows: 
(in millions)
Retirement Plans
 
Postretirement Plans
 
2016
 
2015
 
2016
 
2015
Service cost
$
1

 
$
2

 
$
—

 
$
—

Interest cost
20

 
24

 
1

 
1

Expected return on plan assets
(31
)
 
(32
)
 
—

 
—

Amortization of actuarial loss
4

 
5

 
—

 
—

Net periodic benefit (credit) cost
$
(6
)
 
$
(1
)
 
$
1

 
$
1