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Other Income - Net
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Other Income - Net
Other Income - Net

The Company derives income from items that are not considered operating activities. Income from these items is reported net of related expense. Miscellaneous income (expense) includes investment gains and losses, certain non-operating equity earnings or losses and other non-operating activities and may fluctuate due to timing. 

As substantially all real estate activities are focused on supporting railroad operations, beginning in first quarter 2017, all results of these activities are included in operating income. Previously, these activities were classified as operating or non-operating based on the nature of the activity. As the results of these activities were not material for any periods presented, prior periods have not been reclassified.

Interest Income increased from 2016 to 2017 primarily due to higher yields on investment securities. Income from real estate operations were recorded as part of operating expenses during 2017.

Other income – net consisted of the following:
 
Fiscal Years 
(Dollars in Millions)
2017
 
2016
 
2015
Interest Income
$
13

 
$
10

 
$
6

Income from Non-operating Real Estate Activities
—

 
27

 
83

Miscellaneous Income (Expense)
8

 
9

 
9

Total Other Income (Expense) - Net
$
21

 
$
46

 
$
98

Gross Revenue from Real Estate
 
 
 
 
 
Operations included above
$
—

 
$
56

 
$
104