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Insurance Contracts - Contracts Initially Recognized in the Period (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Insurance
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	$ 119	$ 70
Total onerous contracts	119	70
Insurance | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	112	61
Total onerous contracts	112	61
Insurance | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	7	9
Total onerous contracts	7	9
Insurance | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Estimates of present value of future cash inflows
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(17,721)	(15,745)
Total onerous contracts	(1,278)	(2,107)
Insurance | Estimates of present value of future cash inflows | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(9,182)	(9,564)
Total onerous contracts	(1,186)	(1,978)
Insurance | Estimates of present value of future cash inflows | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Estimates of present value of future cash inflows | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(8,539)	(6,181)
Total onerous contracts	(92)	(129)
Insurance | Estimates of present value of future cash inflows | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Insurance acquisition cash flows
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	2,777	2,286
Total onerous contracts	122	102
Insurance | Insurance acquisition cash flows | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	1,033	1,009
Total onerous contracts	101	77
Insurance | Insurance acquisition cash flows | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Insurance acquisition cash flows | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	1,744	1,277
Total onerous contracts	21	25
Insurance | Insurance acquisition cash flows | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Other cash outflows
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	13,085	11,757
Total onerous contracts	1,146	1,953
Insurance | Other cash outflows | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	7,456	7,804
Total onerous contracts	1,076	1,845
Insurance | Other cash outflows | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Other cash outflows | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	5,629	3,953
Total onerous contracts	70	108
Insurance | Other cash outflows | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Risk adjustment
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	530	513
Total onerous contracts	129	122
Insurance | Risk adjustment | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	293	260
Total onerous contracts	121	117
Insurance | Risk adjustment | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | Risk adjustment | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	237	253
Total onerous contracts	8	5
Insurance | Risk adjustment | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Insurance | CSM
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	1,448	1,259
Insurance | CSM | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	512	552
Insurance | CSM | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Insurance | CSM | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	936	707
Insurance | CSM | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	44	35
Reinsurance contracts held | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Reportable segments | Canada | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	43	34
Reinsurance contracts held | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Reportable segments | U.S. | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Reinsurance contracts held | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Reportable segments | Asia | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	1	1
Reinsurance contracts held | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Reportable segments | Corporate | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Total onerous contracts	0	0
Reinsurance contracts held | Estimates of present value of future cash inflows
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	564	349
Reinsurance contracts held | Estimates of present value of future cash inflows | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	158	149
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	275	264
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | Canada | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	155	148
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | U.S. | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	289	85
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | Asia | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	3	1
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash inflows | Reportable segments | Corporate | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(620)	(394)
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(148)	(148)
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(275)	(277)
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | Canada | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(145)	(147)
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | U.S. | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(345)	(117)
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | Asia | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(3)	(1)
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Estimates of present value of future cash outflows, premiums and other expenses | Reportable segments | Corporate | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Risk adjustment
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	120	102
Reinsurance contracts held | Risk adjustment | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	56	45
Reinsurance contracts held | Risk adjustment | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	82	70
Reinsurance contracts held | Risk adjustment | Reportable segments | Canada | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	56	45
Reinsurance contracts held | Risk adjustment | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Risk adjustment | Reportable segments | U.S. | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Risk adjustment | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	38	32
Reinsurance contracts held | Risk adjustment | Reportable segments | Asia | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Risk adjustment | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | Risk adjustment | Reportable segments | Corporate | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | CSM
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(64)	(57)
Reinsurance contracts held | CSM | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(66)	(46)
Reinsurance contracts held | CSM | Reportable segments | Canada
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(82)	(57)
Reinsurance contracts held | CSM | Reportable segments | Canada | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	(66)	(46)
Reinsurance contracts held | CSM | Reportable segments | U.S.
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | CSM | Reportable segments | U.S. | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | CSM | Reportable segments | Asia
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	18	0
Reinsurance contracts held | CSM | Reportable segments | Asia | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | CSM | Reportable segments | Corporate
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	0	0
Reinsurance contracts held | CSM | Reportable segments | Corporate | Loss component
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	$ 0	$ 0

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- Definition

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+ References

No definition available.

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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from the effects of contracts initially recognised in the period. [Refer: Insurance contracts liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2024-01-01
-Paragraph 107
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_107&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 a
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_104_a_iii&doctype=Standard
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- Definition

The increase (decrease) in insurance contracts liability (asset) resulting from the effects of groups of onerous contracts initially recognised in the period. An insurance contract is onerous at the date of initial recognition if the fulfilment cash flows allocated to the contract, any previously recognised acquisition cash flows and any cash flows arising from the contract at the date of initial recognition in total are a net outflow. [Refer: Insurance contracts liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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