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Benefit Plans - Postretirement assumptions and trends (Details) - Postemployment Retirement Benefits	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted average assumptions used to determine the company's obligations
Discount rate (as a percent)	5.24%	4.92%
Weighted average assumptions used to determine the company's net periodic benefit cost
Discount rate (as a percent)	4.93%	5.46%	5.30%
US
Assumptions used in measuring benefit obligation
2018 increase in per capita cost (as a percent)	6.30%
Ultimate trend (as a percent)	4.50%
Year ultimate trend reached	2037
Canada
Assumptions used in measuring benefit obligation
2018 increase in per capita cost (as a percent)	5.92%
Ultimate trend (as a percent)	4.00%
Year ultimate trend reached	2040
Brazil
Assumptions used in measuring benefit obligation
2018 increase in per capita cost (as a percent)	7.90%
Ultimate trend (as a percent)	7.90%
Year ultimate trend reached	2018

X

- Definition

Represents the expected percentage of increase or decrease in per capita cost in next fiscal year, which is used as assumption in measuring expected cost of benefits covered by the plan.

+ References

No definition available.

+ Details

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- References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- References

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- Definition

Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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