Share-Based Compensation - Deferred Compensation Plans and Cash Settle Awards (Details) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) shares
BMO Share Plans
Deferred Compensation Plans
Liability related to cash settle awards \| $	$ 48
Compensation and commission deferrals \| Ameriprise Financial Deferred Compensation Plan
Deferred Compensation Plans
Vesting period	3 years
Compensation and commission deferrals \| Ameriprise Financial Franchise Advisor Deferral Plan
Deferred Compensation Plans
Maximum awards that may be granted	12.5
Compensation and commission deferrals \| Ameriprise Financial Franchise Advisor Deferral Plan \| Minimum
Deferred Compensation Plans
Vesting period	3 years
Compensation and commission deferrals \| Ameriprise Financial Franchise Advisor Deferral Plan \| Maximum
Deferred Compensation Plans
Vesting period	4 years
Compensation and commission deferrals \| Ameriprise Advisor Group Deferred Compensation Plan
Deferred Compensation Plans
Maximum awards that may be granted	3.0

Amount of liability recognized in a business combination arising from a share-based payment arrangement of the acquiree in which share based awards granted to employees of the acquiree prior to the acquisition will be maintained and settled in cash.

No definition available.

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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

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

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-Publisher FASB
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