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Revenue from Contracts with Customers - Contract Liabilities, Capitalized Costs and Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Revenue disaggregated by segment    
Receivables for revenue from contracts with customers $ 500 $ 403
Financial planning fees    
Revenue disaggregated by segment    
Contract liabilities 144 146
Capitalized contract costs 115 117
Transaction and other fees    
Revenue disaggregated by segment    
Contract liabilities $ 14 $ 0