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Revenue from Contracts with Customers - Contract Liabilities, Capitalized Costs and Receivables (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Revenue disaggregated by segment |  |
Receivables for revenue from contracts with customers | $ 537 | $ 537
Financial planning fees | Other liabilities |  |
Revenue disaggregated by segment |  |
Contract liabilities | 168 | 160
Financial planning fees | Other assets |  |
Revenue disaggregated by segment |  |
Capitalized contract costs | 135 | 129
Management and financial advice fees | European-based asset management business of BMO Financial Group |  |
Revenue disaggregated by segment |  |
Capitalized contract costs | $ 25 | $ 33

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