v3.22.1
Revenue - Schedule of Estimated Investment Advisory, Administration Fees Expected to be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail) - Investment Advisory, Administration Fees and Securities Lending Revenue [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation $ 481 $ 516
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   9 months
Revenue, Remaining Performance Obligation   $ 118
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   1 year
Revenue, Remaining Performance Obligation   $ 154
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-04-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 9 months  
Revenue, Remaining Performance Obligation $ 130  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year 1 year
Revenue, Remaining Performance Obligation $ 159 $ 122
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year 1 year
Revenue, Remaining Performance Obligation $ 96 $ 75
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year
Revenue, Remaining Performance Obligation $ 58 $ 47
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01    
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period  
Revenue, Remaining Performance Obligation $ 38