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Employee benefits - Underfunded pension plans - Assets by category (Details) - Underfunded Pension Plans [Member] - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | $ 2 | $ 75
Equity securities | 55 | 1,711
Real estate, amount contributed to fair value of plan assets | 6 | 3
Loans to participants, amount contributed to fair value of plan assets | 1 | 1
Other | 125 | 168
Total | 339 | 3,778
Loans to corporate entities [member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 24 | 556
Governmental Bonds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 65 | 816
Fixed Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 40 | 38
Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 13 | 229
Ifrs Private Equity Funds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Structured debt, amount contributed to fair value of plan assets | 8 | 181
Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 2 | 70
Equity securities |  | 3
Total | 51 | 1,485
Level 2 of fair value hierarchy [member] | Loans to corporate entities [member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 24 | 556
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 19 | 683
Level 2 of fair value hierarchy [member] | Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 6 | 173
Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets |  | 5
Equity securities | 55 | 1,708
Total | 148 | 1,887
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 46 | 133
Level 1 of fair value hierarchy [member] | Fixed Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 40 | 38
Level 1 of fair value hierarchy [member] | Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 7 | 3
Level 3 Of Fair Values Hierarchy [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Real estate, amount contributed to fair value of plan assets | 6 | 3
Loans to participants, amount contributed to fair value of plan assets | 1 | 1
Other | 125 | 168
Total | 140 | 406
Level 3 Of Fair Values Hierarchy [Member] | Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets |  | 53
Level 3 Of Fair Values Hierarchy [Member] | Ifrs Private Equity Funds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Structured debt, amount contributed to fair value of plan assets | $ 8 | $ 181

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- Definition The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 142 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_142_a&doctype=Standard -URIDate 2022-03-24 + Details
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