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Other assets impairments, restructuring and other items - Summary of Restructuring Accruals (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ (122)	$ (215)
Provision	(96)	(82)
Utilization and other	90	188
Ending balance	(128)	(109)
Employee termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	(115)	(208)
Provision	(84)	(39)
Utilization and other	78	145
Ending balance	(121)	(102)
Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	(7)	(7)
Provision	(12)	(43)
Utilization and other	12	43
Ending balance	$ (7)	$ (7)

X

- Definition

Restructuring Accrual Provision

+ References

No definition available.

+ Details

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X

- Definition

Utilization and other.

+ References

No definition available.

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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