Retirement and Employee Benefit Plans Assumptions (Details)	Dec. 31, 2017	Dec. 31, 2016
United States plans
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	0.00%	0.00%
United States plans \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.00%	1.00%
United States plans \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.50%	4.00%
International plans \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.60%	1.90%
Rate of compensation increase	2.00%	2.00%
International plans \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	6.75%	7.50%
Rate of compensation increase	3.50%	3.50%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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