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Risk management (Details 11) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | $ 7,996,000,000 | $ 10,467,000,000
Marketable securities | 4,337,000,000 | 694,000,000
Aa Credit Grades One [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents |  | 1,152,000,000
A Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 3,806,000,000 | 1,145,000,000
Marketable securities | 820 |
B B B Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 212,000,000 | 2,308,000,000
B B Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 917,000,000 | 3,672,000,000
Marketable securities | 205,000,000 |
Aaa Point Br Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 3,034,000,000 | 530,000,000
Marketable securities | 3,311,000,000 | 694,000,000
Aa Point Br Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | 1,000,000 | 1,639,000,000
Marketable securities | 1,000,000 |
Other Credit Grades [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cash and cash equivalents | $ 26,000,000 | $ 21,000,000

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