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Other Income, Net (Tables)
 6 Months Ended
Jun. 30, 2019
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
 
2018
 
2019
 
2018
 
2019
Gains / (Losses) on derivatives
$
(35
)
 
$
178

 
$
(122
)
 
$
—

Currency revaluation gains / (losses)
(18
)
 
(147
)
 
44

 
(16
)
Interest and investment income
49

 
83

 
$
91

 
$
162

Other
5

 
10

 
25

 
37

Total other income, net
$
1

 
$
124

 
$
38

 
$
183