Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Revenue disaggregated by segment
Receivables for revenue from contracts with customers	$ 552	$ 537
Financial planning fees \| Other liabilities
Revenue disaggregated by segment
Contract liabilities	167	168
Financial planning fees \| Other assets
Revenue disaggregated by segment
Capitalized contract costs	133	135
Custodial service fees \| Other liabilities
Revenue disaggregated by segment
Contract liabilities	39	0
Management and financial advice fees \| European-based asset management business of BMO Financial Group
Revenue disaggregated by segment
Capitalized contract costs	$ 23	$ 25

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

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

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