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Revenue from Contracts with Customers - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Revenue disaggregated by segment    
Contract costs asset $ 39 $ 39
Receivables for revenue from contracts with customers 609 668
Financial planning fees    
Revenue disaggregated by segment    
Contract liabilities 155 157
Capitalized contract costs 123 126
Transaction and other fees    
Revenue disaggregated by segment    
Contract liabilities $ 39 $ 0