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Other (Income) Expense, Net (Tables)
 6 Months Ended
Jun. 30, 2017
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
($ in millions)
2017
 
2016
 
2017
 
2016
Interest income
$
(96
)
 
$
(78
)
 
$
(194
)
 
$
(157
)
Interest expense
193

 
171

 
375

 
343

Exchange losses
19

 
37

 
11

 
76

Equity (income) loss from affiliates
(5
)
 
(4
)
 
8

 
(38
)
Other, net
(53
)
 
(107
)
 
(83
)
 
(157
)
 
$
58

 
$
19

 
$
117

 
$
67