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Taxation - Summary of tax relating to components of other comprehensive income or loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract]
– Cash flow hedge fair value gains	$ (6)	$ (54)	$ (1)
Tax credit/(charge) on actuarial gains and losses on post-retirement benefit plans	83	(271)	(12)
Adjustments to deferred tax on post-retirement benefit plans due to changes in corporate tax rates in the US and France	0	0	(140)
Tax relating to components of other comprehensive income/(loss) for the year	$ 77	$ (325)	$ (153)

X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

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No definition available.

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

+ References

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- Definition

Income tax relating to Adjustments to deferred tax on post-retirement benefit plans due to changes in corporate tax rates in the US and France.

+ References

No definition available.

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