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Employee benefits - Overfunded pension plans - Assets by category (Details) - Overfunded 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 |  | $ 55 | $ 1
Equity securities |  | 1,115 |
International investments, amount contributed to fair value of plan assets |  | 254 | 91
Real estate, amount contributed to fair value of plan assets |  | 293 | 212
Loans to participants, amount contributed to fair value of plan assets |  | 128 | 106
Total |  | 8,062 | 5,301
Amount of funds not related to risk employee benefit plans | [1] | (1,722) | (1,549)
Plan assets, at fair value |  | 6,340 | 3,752
Loans to corporate entities [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Debt instruments, amount contributed to fair value of plan assets |  | 368 | 75
Governmental Bonds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Debt instruments, amount contributed to fair value of plan assets |  | 3,789 | 2,042
Fixed Income [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investment funds, amount contributed to fair value of plan assets |  | 1,173 | 2,085
Equity investments [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investment funds, amount contributed to fair value of plan assets |  | 456 | 452
Ifrs Private Equity Funds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Structured debt, amount contributed to fair value of plan assets |  | 428 | 232
Ifrs Real Estate Funds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Structured debt, amount contributed to fair value of plan assets |  | 3 | 5
Level 2 of fair value hierarchy [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Cash and cash equivalents, amount contributed to fair value of plan assets |  | 55 | 1
International investments, amount contributed to fair value of plan assets |  | 231 |
Total |  | 1,410 | 379
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 |  | 367 | 74
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Debt instruments, amount contributed to fair value of plan assets |  | 435 |
Level 2 of fair value hierarchy [member] | Fixed Income [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investment funds, amount contributed to fair value of plan assets |  | 133 | 175
Level 2 of fair value hierarchy [member] | Equity investments [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investment funds, amount contributed to fair value of plan assets |  | 1 |
Level 2 of fair value hierarchy [member] | Ifrs Private Equity Funds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Structured debt, amount contributed to fair value of plan assets |  | 188 | 129
Level 1 of fair value hierarchy [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Equity securities |  | 1,115 |
International investments, amount contributed to fair value of plan assets |  | 23 | 91
Total |  | 5,988 | 4,496
Level 1 of fair value hierarchy [member] | Loans to corporate entities [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Debt instruments, amount contributed to fair value of plan assets |  | 1 | 1
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Debt instruments, amount contributed to fair value of plan assets |  | 3,354 | 2,042
Level 1 of fair value hierarchy [member] | Fixed Income [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investment funds, amount contributed to fair value of plan assets |  | 1,040 | 1,910
Level 1 of fair value hierarchy [member] | Equity investments [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Investment funds, amount contributed to fair value of plan assets |  | 455 | 452
Level 3 of fair value hierarchy [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Real estate, amount contributed to fair value of plan assets |  | 293 | 212
Loans to participants, amount contributed to fair value of plan assets |  | 128 | 106
Total |  | 664 | 426
Level 3 of fair value hierarchy [member] | Ifrs Private Equity Funds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Structured debt, amount contributed to fair value of plan assets |  | 240 | 103
Level 3 of fair value hierarchy [member] | Ifrs Real Estate Funds [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Structured debt, amount contributed to fair value of plan assets |  | $ 3 | $ 5
[1] | Financial investments not related to coverage of overfunded pension plans. Funds are related to the Company´s unconsolidated entities and former employees.

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