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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Revenue disaggregated by segment |  |
Receivables for revenue from contracts with customers | $ 514 | $ 537
Financial planning fees | Other liabilities |  |
Revenue disaggregated by segment |  |
Contract liabilities | 166 | 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 | 26 | 0
Management and financial advice fees | European-based asset management business of BMO Financial Group |  |
Revenue disaggregated by segment |  |
Capitalized contract costs | $ 20 | $ 25

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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