Financial instruments related to commodity contracts - Cash flow hedge (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flow hedge
Ineffective portion of the cash flow hedges	$ 0	$ 0	$ 0
Financial instruments related to commodity contracts
Cash flow hedge
Profit (Loss) recorded in equity during the period	71	(69)
Recycled amount from equity to the income statement during the period	(6)	(1)
Ineffective portion of the cash flow hedges	$ 0	$ (5)	$ 0
Cash flow hedge \| Financial instruments related to commodity contracts
Cash flow hedge
Maximum maturity of most derivatives	1 year

No definition available.

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- Definition

The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]]

+ References

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- Definition

The gains (losses) on the ineffective portion of cash flow hedges recognised in profit or loss. [Refer: Cash flow hedges [member]]

+ References

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- Definition

The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

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- Definition

The maximum maturity period for the majority of the derivatives in the specified category.

+ References

No definition available.

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