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Significant Accounting Policies - 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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues	$ 4,468	$ 4,093	$ 4,177	$ 4,149	$ 4,419	$ 4,385	$ 4,552	$ 4,916	$ 16,887	$ 18,271	$ 21,853
Net revenues [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues										18,271	21,853
Cost of sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues										9,975	11,237
As reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		4,264	4,337	4,295	4,559	4,529	4,701	5,065
As reported [Member] | Net revenues [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues										18,854	22,385
As reported [Member] | Cost of sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues										10,558	11,770
Restatement adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues		$ (171)	$ (159)	$ (146)	$ (141)	$ (143)	$ (150)	$ (149)
Restatement adjustment [Member] | Net revenues [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues										(583)	(533)
Restatement adjustment [Member] | Cost of sales [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net revenues										$ (583)	$ (533)

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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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