Additional information about derivatives financial instruments - Wheaton Precious Metals Corp. warrants (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) EquityInstruments $ / shares	Dec. 31, 2017 USD ($) EquityInstruments	Dec. 31, 2016 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (67)	$ (240)	$ (1,602)
Call options -SLW- Bought
Derivative financial instruments.
Notional (quantity) \| EquityInstruments	10,000,000	10,000,000
Average strike per share \| $ / shares	44
Fair value of assets	$ 8	$ 39
Value at risk	1
Call options -SLW- Bought \| 2023
Derivative financial instruments.
Fair value of assets	$ 8

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

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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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 average strike rate per share.

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- Definition

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

+ References

No definition available.

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