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Lease Commitments (Tables)
12 Months Ended
Dec. 31, 2015
Leases [Abstract]  
Future Minimum Lease Payments
Future minimum lease payments and operating lease expense are as follows:

Future Minimum Lease Payments
 
 
Operating
Leases
 
($ in millions)
 
 
2016
$
77

2017
73

2018
65

2019
51

2020
50

2021 and subsequent years
348

 
 
Total
$
664

Operating Lease Expense
Operating Lease Expense
 
 
2015
 
2014
 
2013
 
($ in millions)
 
 
 
 
 
 
Minimum rents
$
111

 
$
109

 
$
121

Contingent rents
84

 
92

 
82

 
 
 
 
 
 
Total
$
195

 
$
201

 
$
203