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12. Commitments & Contingent Liabilities Assumptions for Benefit Obligations and Periodic Benefit Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Assumptions Used [Table Text Block] Assumptions

The weighted-average assumptions used in computing the benefit obligations are as follows:


 
2017
2016
Discount rate
0.8
%
0.9
%
Compensation rate increase
1.8
%
1.6
%
 
 
 

The weighted-average assumptions used in computing the net periodic benefit costs are as follows:

 
2017
2016
2015
Discount rate
0.9
%
1.1
%
1.3
%
Expected long-term rate of return on plan assets
1.9
%
1.6
%
2.3
%