EQUITY - Schedule Of Options (Details) - Equity-Settled Share-Based Payment Arrangement $ / shares in Units, shares in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) shares $ / shares	Dec. 31, 2020 USD ($) shares $ / shares	Dec. 31, 2019 shares $ / shares
Management Share Option Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average share price, share options granted \| $ / shares	$ 43.43	$ 45.21
Management Share Option Plan \| NYSE Common Class A Shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of share options outstanding in share-based payment arrangement \| shares	43,794,000	47,367,000	50,703,000
Weighted average exercise price of share options outstanding in share-based payment arrangement \| $ / shares	$ 27.58	$ 25.08	$ 22.69
Number of share options granted in share-based payment arrangement \| shares	4,185,000	3,341,000
Weighted average exercise price of share options granted in share-based payment arrangement \| $ / shares	$ 43.43	$ 45.21
Exercised (in shares) \| shares	(7,388,000)	(6,382,000)
Weighted average exercise price of share options exercised in share-based payment arrangement \| $ / shares	$ 20.15	$ 16.50
Number Of Share Options Cancelled In Share-Based Payment Arrangement \| shares	(370,000)	(295,000)
Weighted average exercise price of share options exercised (in dollars per share) \| $	$ 34.49	$ 27.80
Escrowed Stock Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of share options outstanding in share-based payment arrangement \| shares	50,378,000	46,716,000	54,791,000
Weighted average exercise price of share options outstanding in share-based payment arrangement \| $ / shares	$ 30.70	$ 28.88	$ 25.82
Number of share options granted in share-based payment arrangement \| shares	5,300,000	3,841,000
Exercised (in shares) \| shares	(1,621,000)	(11,613,000)
Weighted average exercise price of share options exercised in share-based payment arrangement \| $ / shares	$ 20.01	$ 19.66
Number Of Share Options Cancelled In Share-Based Payment Arrangement \| shares	(17,000)	(303,000)
Weighted average share price, share options granted \| $ / shares	$ 43.53	$ 45.21
Weighted average exercise price of share options expired in share-based payment arrangement \| $ / shares	$ 44.35	$ 35.85

Number Of Share Options Cancelled In Share-Based Payment Arrangement

No definition available.

Name:	bam_NumberOfShareOptionsCancelledInShareBasedPaymentArrangement
Namespace Prefix:	bam_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted Average Exercise Price Of Share Options Cancelled In Share-Based Payment Arrangement

+ References

No definition available.

+ Details

Name:	bam_WeightedAverageExercisePriceOfShareOptionsCancelledInShareBasedPaymentArrangement
Namespace Prefix:	bam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of share options outstanding in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard
-URIDate 2021-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_NumberOfOutstandingShareOptions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of share options exercised in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iv&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_ii&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average exercise price of share options exercised in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average exercise price of share options expired in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause v
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_v&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average exercise price of share options outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	bam_AwardType1Axis=bam_EquitySettledManagementShareOptionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=bam_EquitySettledShareBasedPaymentArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bam_ClassofStockAxis=bam_NYSECommonClassASharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bam_AwardType1Axis=bam_EquitySettledEscrowedStockPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: