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Insurance Contracts - Contracts Initially Recognized in the Period (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Insurance
Disclosure of reconciliation of changes in insurance contracts by components [line items]
Total contracts initially recognized in the period (excluding acquisitions)	$ 70	$ 91
Total onerous contracts	70	91
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)	61	82
Total onerous contracts	61	82
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)	9	9
Total onerous contracts	9	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)	(15,745)	(11,290)
Total onerous contracts	(2,107)	(1,034)
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)	(9,564)	(7,727)
Total onerous contracts	(1,978)	(927)
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)	(6,181)	(3,563)
Total onerous contracts	(129)	(107)
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)	2,286	1,347
Total onerous contracts	102	87
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)	1,009	746
Total onerous contracts	77	59
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)	1,277	601
Total onerous contracts	25	28
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)	11,757	8,684
Total onerous contracts	1,953	923
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)	7,804	6,356
Total onerous contracts	1,845	840
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)	3,953	2,328
Total onerous contracts	108	83
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)	513	456
Total onerous contracts	122	115
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)	260	264
Total onerous contracts	117	110
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)	253	192
Total onerous contracts	5	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)	1,259	894
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)	552	443
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)	707	451
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	35	23
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	34	23
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	0
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)	349	300
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)	149	146
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)	264	259
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)	148	143
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)	85	41
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)	1	3
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)	(394)	(337)
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)	(143)
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)	(277)	(265)
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)	(147)	(141)
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)	(117)	(72)
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)	(1)	(2)
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 | 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)	0	0
Reinsurance contracts held | Insurance acquisition cash flows | 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 | 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)	0	0
Reinsurance contracts held | Insurance acquisition cash flows | 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
Reinsurance contracts held | 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
Reinsurance contracts held | Insurance acquisition cash flows | 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 | 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)	0	0
Reinsurance contracts held | Insurance acquisition cash flows | 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 | 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
Reinsurance contracts held | Insurance acquisition cash flows | 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)	102	95
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)	45	42
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)	70	69
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)	45	42
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)	32	26
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)	(57)	(58)
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)	(46)	(45)
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)	(57)	(63)
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)	(46)	(44)
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)	0	5
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	(1)
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 2023-01-01
-Paragraph 107
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2023-en-r&anchor=para_107&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 17
-IssueDate 2023-01-01
-Paragraph 104
-Subparagraph a
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2023-en-r&anchor=para_104_a_iii&doctype=Standard
-URIDate 2023-03-23

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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
-Name IFRS
-Number 17
-IssueDate 2023-01-01
-Paragraph 108
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2023-en-r&anchor=para_108_b&doctype=Standard
-URIDate 2023-03-23

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