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Other Income, Net
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
OTHER INCOME, NET
OTHER INCOME, NET

Other income consists of various line items that are combined on the income statement due to their respective materiality compared with other individual income and expense items.

The amounts included in Other income, net for the years ended December 31 were as follows (in millions):
 
2016
 
2017
 
2018
Gains / (Losses) on derivatives
$
575

 
$
11

 
$
(165
)
Currency revaluation gains / (losses)
(575
)
 
44

 
12

Interest and investment income (a)
85

 
112

 
198

Insurance fee income
90

 
—

 
—

Other
155

 
83

 
35

Total other income, net
$
330

 
$
250

 
$
80

__________
(a)
Includes interest income primarily on notes receivable from affiliated companies of $5 million, $9 million, and $10 million, for December 31, 2016, 2017, and 2018, respectively.