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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Net Pension Cost (Benefit) for All Funded and Unfunded Plans The components of net pension cost (benefit) for all funded and unfunded plans are as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
in millions
2018

2017

 
2018

2017

Interest cost on PBO
$
10

$
12

 
$
30

$
36

Expected return on plan assets
(13
)
(17
)
 
(39
)
(51
)
Amortization of losses
4

4

 
12

12

Net pension cost
$
1

$
(1
)
 
$
3

$
(3
)
 
 
 
 
 
 
We use a separate VEBA trust to fund the retiree healthcare plan.
 
Three months ended September 30,
 
Nine months ended September 30,
in millions
2018

2017

 
2018

2017

Interest cost on APBO
$
1

$
1

 
$
1

$
1

Expected return on plan assets
(1
)
(1
)
 
(1
)
(1
)
Net postretirement benefit cost
—

—

 
—

—