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Pension and Other Postretirement Benefits - U.S. defined benefit plan (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension and Other Postretirement Benefits
Future expected blended long-term rate of return on plan assets (as a percent)	5.01%
Minimum | U.S. Defined Benefit Plan | Return-seeking investment
Pension and Other Postretirement Benefits
Asset allocation (as a percent)	57.00%	50.00%
Minimum | U.S. Defined Benefit Plan | Liability-hedging investment
Pension and Other Postretirement Benefits
Asset allocation (as a percent)	28.00%	24.00%
Maximum | U.S. Defined Benefit Plan | Return-seeking investment
Pension and Other Postretirement Benefits
Asset allocation (as a percent)	72.00%	76.00%
Maximum | U.S. Defined Benefit Plan | Liability-hedging investment
Pension and Other Postretirement Benefits
Asset allocation (as a percent)	43.00%	50.00%

X

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, 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)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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+ References

No definition available.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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