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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Revenue disaggregated by segment    
Receivables for revenue from contracts with customers $ 486 $ 538
Financial planning fees | Other liabilities    
Revenue disaggregated by segment    
Contract liabilities 177 181
Financial planning fees | Other assets    
Revenue disaggregated by segment    
Capitalized contract costs 141 145
Custodial service fees | Other liabilities    
Revenue disaggregated by segment    
Contract liabilities $ 24 $ 0