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Financial and capital risk management - Debentures convertible into shares (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) R$ / shares	Dec. 31, 2019 USD ($) EquityInstruments	Dec. 31, 2018 USD ($)	Dec. 31, 2020 item	Dec. 31, 2020 EquityInstruments	Dec. 31, 2020	Dec. 09, 2020 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (34)	$ (324)	$ (67)
Call options -Debentures- Sold
Derivative financial instruments.
Notional | EquityInstruments		140,239
Average strike per share				8,346.00		8.00	8.00
Fair value of liabilities		$ (51)
Financial settlement inflows (outflows)	$ 235
Value at risk							$ 241
Debentures convertible into shares
Derivative financial instruments.
Notional | EquityInstruments		1,009			976
Average strike per share | R$ / shares	7,121

X

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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

The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

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- Definition

The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

+ References

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- Definition

The amount of cash inflow (outflow) from settlement of derivatives.

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