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Basis of preparation and accounting policies - VFA eligibility assessment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2022
Statement
Percentage to meet definition of substantial	50.00%
Including JVs and associates
Statement
CSM as at 31 Dec	$ 21,960	$ 21,012
Percentage of CSM calculated under VFA			72.00%
Including JVs and associates | Contractual service margin (CSM)
Statement
CSM amortisation, net of reinsurance, recognised in the income statement	$ (2,352)

X

- Definition

The amount of the contractual service margin. [Refer: Contractual service margin [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2024-01-01
-Paragraph 109
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-URIDate 2024-03-27

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X

- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from recognition of the contractual service margin in profit or loss to reflect the transfer of services. [Refer: Insurance contracts liability (asset); Contractual service margin [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2024-01-01
-Paragraph 104
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_104_b_i&doctype=Standard
-URIDate 2024-03-27

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of CSM calculated under VFA

+ References

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- Definition

Percentage to meet definition of substantial

+ References

No definition available.

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- Details

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