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Other Income, Net (Tables)
 6 Months Ended
Jun. 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 June 30 were as follows (in millions):
 
Second Quarter
 
First Half
 
2017
 
2018
 
2017
 
2018
Gains / (Losses) on derivatives
$
(10
)
 
$
(35
)
 
$
22

 
$
(122
)
Currency revaluation gains / (losses)
56

 
(18
)
 
22

 
44

Interest and investment income
24

 
49

 
47

 
91

Other
16

 
5

 
25

 
25

Total other income, net
$
86

 
$
1

 
$
116

 
$
38