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Insurance and reinsurance contracts - Analysis of movements in insurance and reinsurance contract balances by remaining coverage and incurred claims (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Insurance |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | $ (1,148) | $ (1,106)
Opening liabilities | 139,839 | 126,239
Net opening (assets) liabilities at 1 Jan | 138,691 | 125,133
Insurance revenue |  |
Contracts measured under the modified retrospective approach | (415) | (247)
Contracts measured under the fair value approach | (1,176) | (733)
Other contracts | (8,767) | (8,391)
Total Insurance revenue | (10,358) | (9,371)
Insurance service expense: |  |
Incurred claims and other directly attributable expenses | 4,505 | 4,029
Amortisation of insurance acquisition cash flows | 3,157 | 2,745
Losses or reversal of losses on onerous contracts | 131 | 197
Adjustments to liability for incurred claims | (30) | 142
Insurance service expense | 7,763 | 7,113
Insurance service result | (2,595) | (2,258)
Total net finance (income) expense from insurance and reinsurance contracts | 4,154 | 8,839
Total amount recognised in income statement | 1,559 | 6,581
Effect of movements in exchange rates | (1,763) | 210
Total amount recognised in comprehensive income | (204) | 6,791
Cash flows |  |
Premiums received net of ceding commissions paid | 24,283 | 22,294
Insurance acquisition cash flows | (4,798) | (4,270)
Claims and other insurance service expenses net of recoveries from reinsurance received | (11,427) | (11,082)
Total cash flows | 8,058 | 6,942
Other changes | (293) | (175)
Closing assets | (1,313) | (1,148)
Closing liabilities | 147,565 | 139,839
Net closing (assets) liabilities at 31 Dec | 146,252 | 138,691
RI |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | (2,426) | (1,856)
Opening liabilities | 1,151 | 1,175
Net opening (assets) liabilities at 1 Jan | (1,275) | (681)
Insurance service expense: |  |
Losses or reversal of losses on onerous contracts | 48 | (98)
Adjustments to liability for incurred claims | (33) | (3)
Insurance service expense | 302 | 171
Insurance service result | 302 | 171
Total net finance (income) expense from insurance and reinsurance contracts | 338 | (191)
Total amount recognised in income statement | 640 | (20)
Effect of movements in exchange rates | 9 |
Total amount recognised in comprehensive income | 649 | (20)
Cash flows |  |
Premiums received net of ceding commissions paid | (2,837) | (1,032)
Claims and other insurance service expenses net of recoveries from reinsurance received | 612 | 458
Total cash flows | (2,225) | (574)
Other changes | (3) |
Closing assets | (3,390) | (2,426)
Closing liabilities | 536 | 1,151
Net closing (assets) liabilities at 31 Dec | (2,854) | (1,275)
Liabilities for remaining coverage Excluding loss-recovery component | Insurance |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | (1,285) | (1,200)
Opening liabilities | 137,019 | 123,855
Net opening (assets) liabilities at 1 Jan | 135,734 | 122,655
Insurance revenue |  |
Contracts measured under the modified retrospective approach | (415) | (247)
Contracts measured under the fair value approach | (1,176) | (733)
Other contracts | (8,767) | (8,391)
Total Insurance revenue | (10,358) | (9,371)
Insurance service expense: |  |
Amortisation of insurance acquisition cash flows | 3,157 | 2,745
Insurance service expense | 3,157 | 2,745
Insurance service result | (7,201) | (6,626)
Investment components and premium refunds | (7,008) | (7,095)
Total net finance (income) expense from insurance and reinsurance contracts | 4,007 | 8,792
Total amount recognised in income statement | (10,202) | (4,929)
Effect of movements in exchange rates | (1,695) | 220
Total amount recognised in comprehensive income | (11,897) | (4,709)
Cash flows |  |
Premiums received net of ceding commissions paid | 24,283 | 22,294
Insurance acquisition cash flows | (4,798) | (4,270)
Total cash flows | 19,485 | 18,024
Other changes | (241) | (236)
Closing assets | (1,480) | (1,285)
Closing liabilities | 144,561 | 137,019
Net closing (assets) liabilities at 31 Dec | 143,081 | 135,734
Liabilities for remaining coverage Excluding loss-recovery component | RI |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | (2,023) | (1,460)
Opening liabilities | 1,200 | 1,220
Net opening (assets) liabilities at 1 Jan | (823) | (240)
Insurance service expense: |  |
Insurance service expense | 832 | 640
Insurance service result | 832 | 640
Investment components and premium refunds | 240 | (1)
Total net finance (income) expense from insurance and reinsurance contracts | 338 | (191)
Total amount recognised in income statement | 1,410 | 448
Effect of movements in exchange rates | 12 | (1)
Total amount recognised in comprehensive income | 1,422 | 447
Cash flows |  |
Premiums received net of ceding commissions paid | (2,837) | (1,032)
Total cash flows | (2,837) | (1,032)
Other changes | (4) | 2
Closing assets | (2,783) | (2,023)
Closing liabilities | 542 | 1,200
Net closing (assets) liabilities at 31 Dec | (2,241) | (823)
Liabilities for remaining coverage loss component | Insurance |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | 20 | 14
Opening liabilities | 805 | 622
Net opening (assets) liabilities at 1 Jan | 825 | 636
Insurance service expense: |  |
Incurred claims and other directly attributable expenses | (46) | (42)
Losses or reversal of losses on onerous contracts | 131 | 197
Insurance service expense | 85 | 155
Insurance service result | 85 | 155
Total net finance (income) expense from insurance and reinsurance contracts | 47 | 15
Total amount recognised in income statement | 132 | 170
Effect of movements in exchange rates | (18) | (4)
Total amount recognised in comprehensive income | 114 | 166
Cash flows |  |
Other changes | (20) | 23
Closing assets | 38 | 20
Closing liabilities | 881 | 805
Net closing (assets) liabilities at 31 Dec | 919 | 825
Liabilities for remaining coverage loss component | RI |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | (119) | (29)
Opening liabilities | (15) | (6)
Net opening (assets) liabilities at 1 Jan | (134) | (35)
Insurance service expense: |  |
Insurance service expense | 48 | (98)
Insurance service result | 48 | (98)
Total amount recognised in income statement | 48 | (98)
Effect of movements in exchange rates | 1 |
Total amount recognised in comprehensive income | 49 | (98)
Cash flows |  |
Other changes |  | (1)
Closing assets | (66) | (119)
Closing liabilities | (20) | (15)
Net closing (assets) liabilities at 31 Dec | (86) | (134)
Liabilities for incurred claims | Insurance |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | 117 | 80
Opening liabilities | 2,015 | 1,762
Net opening (assets) liabilities at 1 Jan | 2,132 | 1,842
Insurance service expense: |  |
Incurred claims and other directly attributable expenses | 4,551 | 4,071
Adjustments to liability for incurred claims | (30) | 142
Insurance service expense | 4,521 | 4,213
Insurance service result | 4,521 | 4,213
Investment components and premium refunds | 7,008 | 7,095
Total net finance (income) expense from insurance and reinsurance contracts | 100 | 32
Total amount recognised in income statement | 11,629 | 11,340
Effect of movements in exchange rates | (50) | (6)
Total amount recognised in comprehensive income | 11,579 | 11,334
Cash flows |  |
Claims and other insurance service expenses net of recoveries from reinsurance received | (11,427) | (11,082)
Total cash flows | (11,427) | (11,082)
Other changes | (32) | 38
Closing assets | 129 | 117
Closing liabilities | 2,123 | 2,015
Net closing (assets) liabilities at 31 Dec | 2,252 | 2,132
Liabilities for incurred claims | RI |  |
Movements in insurance and reinsurance contract balances by remaining coverage and incurred claims |  |
Opening assets | (284) | (367)
Opening liabilities | (34) | (39)
Net opening (assets) liabilities at 1 Jan | (318) | (406)
Insurance service expense: |  |
Insurance service expense | (578) | (371)
Insurance service result | (578) | (371)
Investment components and premium refunds | (240) | 1
Total amount recognised in income statement | (818) | (370)
Effect of movements in exchange rates | (4) | 1
Total amount recognised in comprehensive income | (822) | (369)
Cash flows |  |
Claims and other insurance service expenses net of recoveries from reinsurance received | 612 | 458
Total cash flows | 612 | 458
Other changes | 1 | (1)
Closing assets | (541) | (284)
Closing liabilities | 14 | (34)
Net closing (assets) liabilities at 31 Dec | $ (527) | $ (318)

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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from additional items that may be necessary to understand the change in the net carrying amount of the insurance contracts. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 105 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_105_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from changes that relate to past service, ie changes in fulfilment cash flows relating to incurred claims. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 103 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_103_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 104 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_104_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from incurred claims and other incurred insurance service expenses. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 103 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_103_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance acquisition cash flows. Insurance acquisition cash flows are cash flows arising from the costs of selling, underwriting and starting a group of insurance contracts (issued or expected to be issued) that are directly attributable to the portfolio of insurance contracts to which the group belongs. Such cash flows include cash flows that are not directly attributable to individual contracts or groups of insurance contracts within the portfolio. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 105 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_105_a_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance finance income or expenses. [Refer: Insurance contracts liability (asset); Insurance finance income (expenses)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 105 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_105_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance revenue. [Refer: Insurance contracts liability (asset); Insurance revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 103 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_103_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance revenue not related to contracts that existed at the transition date to which the modified retrospective approach (as described in paragraphs C6-C19A of IFRS 17) or the fair value approach (as described in paragraphs C20-C24B of IFRS 17) has been applied. [Refer: Insurance contracts liability (asset); Insurance revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 114 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_114_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance service result. [Refer: Insurance contracts liability (asset); Insurance service result] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_103&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_104&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of insurance contracts liability (asset). [Refer: Assets; Liabilities; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_99_b&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of insurance contracts that are assets. [Refer: Assets; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_99_b&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of insurance contracts that are liabilities. [Refer: Liabilities; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_99_b&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from movements in exchange rates. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of insurance service result and net finance income (expense) relating to insurance and reinsurance contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of insurance service result and net finance income (expense) relating to insurance and reinsurance contracts in other comprehensive income. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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