Employee Benefit Plans (Pension and Postretirement Plans Target and Weighted-Average Asset Allocations) (Details) - Defined Benefit Pension Plans [Member]	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined benefit plan, target plan asset allocations, in percentage	100.00%
Defined benefit plan, actual plan asset allocation, in percentage	100.00%	100.00%
Domestic Plan [Member] | Equity Securities [Member]
Defined benefit plan, target plan asset allocations, in percentage	30.00%
Defined benefit plan, actual plan asset allocation, in percentage	30.00%	28.00%
Domestic Plan [Member] | Debt Securities [Member]
Defined benefit plan, target plan asset allocations, in percentage	70.00%
Defined benefit plan, actual plan asset allocation, in percentage	70.00%	69.00%
Domestic Plan [Member] | Other plan assets [Member]
Defined benefit plan, target plan asset allocations, in percentage	0.00%
Defined benefit plan, actual plan asset allocation, in percentage	0.00%	3.00%
Foreign Plan [Member]
Defined benefit plan, target plan asset allocations, in percentage	100.00%
Defined benefit plan, actual plan asset allocation, in percentage	100.00%	100.00%
Foreign Plan [Member] | Equity Securities [Member]
Defined benefit plan, target plan asset allocations, in percentage	20.00%
Defined benefit plan, actual plan asset allocation, in percentage	18.00%	22.00%
Foreign Plan [Member] | Debt Securities [Member]
Defined benefit plan, target plan asset allocations, in percentage	70.00%
Defined benefit plan, actual plan asset allocation, in percentage	77.00%	68.00%
Foreign Plan [Member] | Other plan assets [Member]
Defined benefit plan, target plan asset allocations, in percentage	10.00%
Defined benefit plan, actual plan asset allocation, in percentage	6.00%	10.00%