Revenue from Contracts with Customers - Contract Liabilities, Capitalized Costs and Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Revenue disaggregated by segment
Receivables for revenue from contracts with customers	$ 537	$ 668
Financial Planning Fees \| Other liabilities
Revenue disaggregated by segment
Contract liabilities	160	157
Financial Planning Fees \| Other assets
Revenue disaggregated by segment
Capitalized contract cost, net	129	126
Management and financial advice fees \| European-based asset management business of BMO Financial Group
Revenue disaggregated by segment
Contract costs	$ 33	$ 39

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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-Name Accounting Standards Codification
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-Section 50
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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional.

+ References

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