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Costs and expenses by nature - Other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Notes and other explanatory information [abstract]
Personnel	$ 52	$ 44	$ 97	$ 98
Services	30	30	58	52
Selling	21	24	39	43
Depreciation and amortization	14	12	25	23
Other	22	17	38	32
Total	$ 139	$ 127	$ 257	$ 248

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The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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The amount of expense relating to selling activities of the entity.

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The amount of expense relating to selling, general and administrative activities of the entity.

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