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Insurance and reinsurance contracts - Products and determining contract liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 01, 2022
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Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Fair value of underlying items for contracts with direct participation features | $ 133,641 | $ 127,570 |
Including JVs and associates |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Percentage of CSM calculated under VFA |  |  | 72.00%
Percentage of CSM calculated under GMM |  |  | 28.00%
RI | A- and above by Standard & Poor's |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Maximum exposure to credit risk percentage | 99.00% | 98.00% |

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