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Employee benefits (Details 8) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | $ 7,944 |
Fair value of plan assets | $ 10,199 | $ 14,384
Percentage, fair value | 100.00% | 100.00%
Quoted prices in active markets, fair value | $ 2,255 |
Quoted prices in active markets | 2,255 |
Unquoted prices | 7,699 |
Total fair value | $ 9,954 | $ 14,078
Percentage | 98.00% | 98.00%
Receivables [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | $ 954 |
Fair value of plan assets | $ 954 | $ 1,466
Percentage, fair value | 9.00% | 10.00%
Fixed income [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | $ 6,150 |
Fair value of plan assets | $ 7,930 | $ 10,910
Percentage, fair value | 78.00% | 75.00%
Quoted prices in active markets, fair value | $ 1,780 |
Government bonds [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | 6,148 |
Fair value of plan assets | 6,153 | $ 9,450
Quoted prices in active markets, fair value | 5 |
Fixed income fund [member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair value of plan assets | 1,162 | 786
Quoted prices in active markets, fair value | 1,162 |
Other investment [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | 2 |
Fair value of plan assets | 615 | 674
Quoted prices in active markets, fair value | 613 |
Variable income [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | 155 |
Fair value of plan assets | $ 479 | $ 945
Percentage, fair value | 3.00% | 5.00%
Quoted prices in active markets, fair value | $ 324 |
Common and preferred shares [member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair value of plan assets | 324 | $ 735
Quoted prices in active markets, fair value | 324 |
Other investment one [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | 155 |
Fair value of plan assets | 155 | 210
Structured investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | 22 |
Fair value of plan assets | $ 173 | $ 216
Percentage, fair value | 4.00% | 4.00%
Quoted prices in active markets, fair value | $ 151 |
Real estate properties [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | 418 |
Fair value of plan assets | $ 418 | $ 541
Percentage, fair value | 4.00% | 4.00%
Loans to participants [member] |  |
IfrsStatementLineItems [Line Items] |  |
Unquoted prices, fair value | $ 245 |
Fair value of plan assets | $ 245 | $ 306
Percentage, fair value | 2.00% | 2.00%

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