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Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation (Parenthetical) (Detail)	Dec. 31, 2020	Dec. 31, 2019
Corporate Bonds [Member]
Defined benefit plan, plan assets target allocation percentage	72.00%	37.00%
Government Bonds [Member]
Defined benefit plan, plan assets target allocation percentage		32.00%
Equity [Member]
Defined benefit plan, plan assets target allocation percentage	13.00%	15.00%
Other Instruments [Member]
Defined benefit plan, plan assets target allocation percentage	15.00%	16.00%

X

- 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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