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Employee benefits - Reconciliation of net liabilities recognized in the statement of financial position (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Overfunded pension plans | Present value of actuarial liabilities
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	$ (3,183)	$ (3,105)
Overfunded pension plans | Fair value of assets
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	4,045	3,969
Overfunded pension plans | Effect of the asset ceiling
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	(862)	(864)
Underfunded pension plans
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	(343)	(641)
Current liabilities	(41)	(47)
Non-current liabilities	(302)	(594)
Liabilities	(343)	(641)
Underfunded pension plans | Present value of actuarial liabilities
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	(4,440)	(4,632)
Underfunded pension plans | Fair value of assets
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	4,097	3,991
Other benefits
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	(1,668)	(1,733)
Current liabilities	(72)	(96)
Non-current liabilities	(1,596)	(1,637)
Liabilities	(1,668)	(1,733)
Other benefits | Present value of actuarial liabilities
Reconciliation of net liabilities recognized in the statement of financial position
Net liabilities recognized	$ (1,668)	$ (1,733)

X

- Definition

The amount of current provisions for employee benefits. [Refer: Provisions for employee benefits]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-Subparagraph d
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+ Details

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X

- Definition

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.

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 140
-Subparagraph a
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X

- Definition

The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
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X

- Definition

The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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