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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 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 periods ended June 30 are as follows: 

Retirement Plans
(in millions)
Three Months
 
Six Months
 
2016
 
2015
 
2016
 
2015
Service cost
$
1

 
$
2

 
$
1

 
$
3

Interest cost
19

 
24

 
39

 
48

Expected return on plan assets
(31
)
 
(32
)
 
(61
)
 
(63
)
Amortization of actuarial loss
4

 
5

 
8

 
10

Net periodic benefit (credit) cost
$
(7
)
 
$
(1
)
 
$
(13
)
 
$
(2
)


Postretirement Plans
(in millions)
Three Months
 
Six Months
 
2016
 
2015
 
2016
 
2015
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
1

 
1

 
1

 
2

Amortization of prior service credit / actuarial gain
(1
)
 
(1
)
 
(1
)
 
(1
)
Net periodic benefit (credit) cost
$
—

 
$
—

 
$
—

 
$
1