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Employee Benefit Plans (Assumptions in Determining Benefit Obligations) (Details) - U.S.
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits    
Assumptions used in determining benefit obligations [Abstract]    
Weighted average discount rate 3.30% 4.35%
Weighted average interest crediting rate 3.99% 4.09%
Pension Benefits | Minimum    
Assumptions used in determining benefit obligations [Abstract]    
Rate of compensation increase 2.25% 2.25%
Pension Benefits | Maximum    
Assumptions used in determining benefit obligations [Abstract]    
Rate of compensation increase 8.50% 8.50%
Other Postretirement Benefits    
Assumptions used in determining benefit obligations [Abstract]    
Weighted average discount rate 3.45% 4.35%