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Employee Benefit Plans (Assumptions for Pension and Postretirement Cost) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Rate of increase in future compensation 1.50% 2.00% 2.25%
Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Rate of increase in future compensation 5.00% 5.00% 5.00%
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Weighted average discount rate 2.70% 3.60% 3.50%
Weighted average expected long-term rate of return on plan assets 5.80% 6.80% 6.80%
UNITED STATES | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Weighted average discount rate 4.25% 4.60% 4.15%
Weighted average expected long-term rate of return on plan assets [1] 6.00% 6.00% 6.00%
Rate of increase in future compensation [2] 5.00% 5.00% 5.00%
[1] Applicable for U.S. funded, qualified plans.
[2] Applicable for U.S. unfunded, nonqualified plan.