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

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

 
$
1

 
$
1

 
$
1

Interest cost
19

 
19

 
37

 
39

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

 
4

 
9

 
8

Net periodic benefit cost
$
(8
)
 
$
(7
)
 
$
(16
)
 
$
(13
)

Postretirement Plans
(in millions)
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
—

 
1

 
1

 
1

Amortization of prior service credit / actuarial gain
(1
)
 
(1
)
 
(2
)
 
(1
)
Net periodic benefit cost
$
(1
)
 
$
—

 
$
(1
)
 
$
—