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Post-retirement benefits - Summary of movement in net defined benefit liability (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	$ 2,273	$ 1,730
Amounts recognised in income statement	(239)	(205)
Amounts recognised in other comprehensive income	1,026	(474)
Employer contributions	464	201	$ 257
Assets transferred to defined contribution section	(4)	(3)
Currency exchange rate (loss)/ gain	(2)	(62)
Ending balance	1,028	2,273	$ 1,730
Pension benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	1,305
Amounts recognised in income statement	(205)
Amounts recognised in other comprehensive income	898
Employer contributions	425
Assets transferred to defined contribution section	(4)
Currency exchange rate (loss)/ gain	(3)
Ending balance	194	1,305
Other benefits
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	968
Amounts recognised in income statement	(34)
Amounts recognised in other comprehensive income	128
Employer contributions	39
Assets transferred to defined contribution section	0
Currency exchange rate (loss)/ gain	1
Ending balance	$ 834	$ 968

X

- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from expense (income) included in profit or loss. [Refer: Net defined benefit liability (asset); Profit (loss)] [Contrast: Post-employment benefit expense in profit or loss, defined benefit plans]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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Assets Transferred to Defined Contribution

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