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Costs and expenses by nature - Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Costs and expenses by nature
Profit sharing program	$ 52	$ 13	$ 75	$ 45
COVID-19 expenses	16	85	18	85
Others	(22)	95	(51)	106
Total	74	237	86	299
Provisions for litigation
Costs and expenses by nature
Provision	$ 28	$ 44	$ 44	$ 63

X

- Definition

The amount of additional other provisions made. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

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- Definition

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of operating income (expense) that the entity does not separately disclose in the disclosure of expenses by nature.

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- Definition

The amount incurred related to response to pandemic event.

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No definition available.

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- Definition

The amount of post-employment benefit expense relating to defined contribution plans included in other operational expenses. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

No definition available.

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