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Financial risk management - D. Financial risk management (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments [Abstract]
Target percent debt in local currency	40.00%
Target percent of debt fixed rate	70.00%
Target percent of debt floating rate	30.00%
Disclosure of detailed information about hedging instruments [line items]
Derivative financial liabilities	$ 0	$ (56)
Cash flow hedges
Disclosure of detailed information about hedging instruments [line items]
Derivative financial liabilities	$ 0	$ (56)

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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Financial Instruments [Abstract]

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- Definition

Financial Risk Management, Target Percent Debt, Fixed Rate

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Financial Risk Management, Target Percent Debt, Floating Rate

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- Definition

Financial Risk Management, Target Percent Debt In Local Currency

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