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Employee Benefits Schedule of Allocation of Plan Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Schedule of Allocation of Plan Assets [Table Text Block]
As of December 31, 2017, the weighted-average target and actual asset allocations relating to our domestic and foreign pension plans' assets are listed below.
 
 
 
December 31,
Asset Class
2018 Target Allocation
 
2017
 
2016
Alternative investments 1
27
%
 
27
%
 
21
%
Equity securities
23
%
 
23
%
 
23
%
Fixed income securities
21
%
 
21
%
 
26
%
Liability driven investments 2
14
%
 
14
%
 
14
%
Real estate
6
%
 
6
%
 
6
%
Other
9
%
 
9
%
 
10
%
Total
100
%
 
100
%
 
100
%
 
1
Alternative investments have the flexibility to dynamically invest across a broad range of asset classes including bonds, equity, cash, property and commodities.
2
Liability driven investment strategies use government bonds as well as derivative instruments to hedge a portion of the impact of interest rates and inflation movements on the long-term liabilities.