Revenue from Contracts with Customers - Contract Liabilities, Capitalized Costs and Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Revenue disaggregated by segment
Receivables for revenue from contracts with customers	$ 668	$ 403
Financial Planning Fees
Revenue disaggregated by segment
Capitalized contract cost, net	126	117
Financial Planning Fees \| Other liabilities
Revenue disaggregated by segment
Contract liabilities	157	$ 146
Management and financial advice fees \| European-based asset management business of BMO Financial Group
Revenue disaggregated by segment
Contract costs	$ 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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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
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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.

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