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Employee benefits - Underfunded pension plans, Measurement of plan assets at fair value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Return on plan assets | $ (13) |
Underfunded Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 3,778 |
Assets as at end of the year | 339 | $ 3,778
Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year |  | 437
Return on plan assets | (32) | 11
Assets purchases | 1 | 67
Assets sold during the year | (3) | (109)
Translation adjustment | (20) |
Transfer between surplus and deficit plans | (212) |
Assets as at end of the year | 140 |
Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 406 |
Return on plan assets | 34 | 11
Assets purchases | 315 | 71
Assets sold during the year | (350) | (113)
Translation adjustment | 26 | (34)
Assets as at end of the year |  | 406
Trading equity securities [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 181 | 250
Return on plan assets | 1 | 11
Assets sold during the year | (2) | (108)
Translation adjustment | (8) |
Transfer between surplus and deficit plans | (164) |
Assets as at end of the year | 8 | 181
Trading equity securities [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Return on plan assets | (5) | 10
Assets purchases | 10 | 28
Assets sold during the year | (36) | (25)
Translation adjustment | 4 | (8)
Equity investments [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 53 |
Return on plan assets |  | 14
Transfer between surplus and deficit plans | (53) |
Assets as at end of the year |  | 53
Equity investments [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets purchases |  | 39
Ifrs Real Estate Funds [Member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 3 | 5
Return on plan assets |  |
Assets as at end of the year | 6 | 3
Ifrs Real Estate Funds [Member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Return on plan assets | (2) |
Loan To Participants [Member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 1 | 2
Translation adjustment |  | (1)
Assets as at end of the year | 1 | 1
Loan To Participants [Member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Return on plan assets | 26 | 16
Assets purchases | 280 | 67
Assets sold during the year | (292) | (74)
Translation adjustment | 8 | (8)
Others [Member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets as at beginning of the year | 168 | 180
Return on plan assets | (33) | (14)
Translation adjustment | (10) | 2
Assets as at end of the year | 125 | 168
Investment property [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Assets purchases | 1 |
Assets sold during the year | (1) | (1)
Translation adjustment | (2) | (1)
Transfer between surplus and deficit plans | 5 |
Investment property [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Return on plan assets | 15 | (15)
Assets purchases | 25 | 4
Assets sold during the year | (22) | (14)
Translation adjustment | $ 14 | $ (18)

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