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Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six months ended June 30,
in millions
2018

2017

 
2018

2017

Interest cost on PBO
$
10

$
12

 
$
20

$
24

Expected return on plan assets
(13
)
(17
)
 
(26
)
(34
)
Amortization of losses
4

4

 
8

8

Net pension cost
$
1

$
(1
)
 
$
2

$
(2
)