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Employee benefits (Details 9) - Overfunded Pension Plans [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | $ 14 | $ 55
Equity securities | 261 | 1,115
International investments, amount contributed to fair value of plan assets | 245 | 254
Real estate, amount contributed to fair value of plan assets | 235 | 293
Loans to participants, amount contributed to fair value of plan assets | 162 | 128
Other, amount contributed to fair value of plan assets | 187 |
Total | 7,835 | 8,062
Amount of funds not related to risk employee benefit plans | (2,178) | (1,722)
Plan assets, at fair value | 5,657 | 6,340
Loans to corporate entities [member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 396 | 368
Governmental Bonds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 4,175 | 3,789
Fixed Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 1,553 | 1,173
Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 484 | 456
Ifrs Private Equity Funds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Structured debt, amount contributed to fair value of plan assets | 123 | 428
Ifrs Real Estate Funds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Structured debt, amount contributed to fair value of plan assets |  | 3
Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 14 | 55
International investments, amount contributed to fair value of plan assets | 186 | 231
Total | 1,171 | 1,410
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 | 396 | 367
Level 2 of fair value hierarchy [member] | Governmental Bonds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 361 | 435
Level 2 of fair value hierarchy [member] | Fixed Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 162 | 133
Level 2 of fair value hierarchy [member] | Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 1 | 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 | 51 | 188
Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity securities | 261 | 1,115
International investments, amount contributed to fair value of plan assets | 59 | 23
Total | 6,008 | 5,988
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
Level 1 of fair value hierarchy [member] | Governmental Bonds [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Debt instruments, amount contributed to fair value of plan assets | 3,814 | 3,354
Level 1 of fair value hierarchy [member] | Fixed Income [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 1,391 | 1,040
Level 1 of fair value hierarchy [member] | Equity investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Investment funds, amount contributed to fair value of plan assets | 483 | 455
Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Real estate, amount contributed to fair value of plan assets | 235 | 293
Loans to participants, amount contributed to fair value of plan assets | 162 | 128
Other, amount contributed to fair value of plan assets | 187 |
Total | 656 | 664
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 | $ 72 | 240
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

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