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Revenue from Contracts with Customers - Contract Liabilities, Capitalized Costs and Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Revenue disaggregated by segment    
Receivables for revenue from contracts with customers $ 538 $ 537
Financial planning fees | Other liabilities    
Revenue disaggregated by segment    
Contract liabilities 181 168
Financial planning fees | Other assets    
Revenue disaggregated by segment    
Capitalized contract costs $ 145 $ 135