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Basis of presentation - Summary of impact of the revision on net revenues and cost of sales in the consolidated statement of income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues	$ 4,357	$ 4,149
Net revenues [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		4,149
Cost of sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		2,293
As reported [Member] | Net revenues [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		4,295
As reported [Member] | Cost of sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		2,440
Restatement adjustment [Member] | Net revenues [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		(146)
Restatement adjustment [Member] | Cost of sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		$ (146)

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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