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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic benefit cost (credit) for our retirement plans and postretirement plans
The components of net periodic benefit cost for our retirement plans and postretirement plans for the periods ended September 30 are as follows: 

Retirement Plans
(in millions)
Three Months
 
Nine Months
 
2017
 
2016
 
2017
 
2016
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
19

 
19

 
55

 
59

Expected return on assets
(32
)
 
(30
)
 
(95
)
 
(92
)
Amortization of actuarial loss
4

 
4

 
14

 
12

Net periodic benefit cost
$
(8
)
 
$
(6
)
 
$
(24
)
 
$
(19
)

Postretirement Plans
(in millions)
Three Months
 
Nine Months
 
2017
 
2016
 
2017
 
2016
Interest cost
$
—

 
$
1

 
$
1

 
$
2

Amortization of prior service credit / actuarial gain
—

 
(1
)
 
(2
)
 
(1
)
Net periodic benefit cost
$
—

 
$
—

 
$
(1
)
 
$
1