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Other Income, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Schedule of Other Income [Table Text Block]
The amounts included in Other income, net for the periods ended September 30 were as follows (in millions):
 
Third Quarter
 
First Nine Months
 
2017
 
2018
 
2017
 
2018
Gains / (Losses) on derivatives
$
(36
)
 
$
(60
)
 
$
(15
)
 
$
(182
)
Currency revaluation gains / (losses)
51

 
36

 
73

 
80

Interest and investment income
33

 
49

 
80

 
140

Other
9

 
11

 
35

 
36

Total other income, net
$
57

 
$
36

 
$
173

 
$
74