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Risk management (Details 13) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | $ 12,727 | $ 7,996
Marketable securities | 5,228 | 4,337
Aa Credit Grades One [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 593 |
Marketable securities | 651 |
A Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 6,890 | 3,806
Marketable securities | 464 | 820
B B B Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 20 | 212
B B Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 3,251 | 917
Marketable securities |  | 205
Aaa Point Br Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 1,966 | 3,034
Marketable securities | 4,113 | 3,311
Aa Point Br Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents |  | 1
Marketable securities |  | 1
Other Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | $ 7 | $ 26

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