v3.26.1
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, 2026
Mar. 31, 2025
Schedule of Investment Advisory Administration Fees and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation [1],[2] $ 1,114 $ 1,393
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01    
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 [1],[2]   $ 369
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   1 year
Revenue, Remaining Performance Obligation [1],[2]   $ 445
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-04-01    
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 [1],[2] $ 355  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01    
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 [1],[2] $ 451 $ 416
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01    
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 [1],[2] $ 233 $ 131
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01    
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 [1],[2] $ 40 $ 32
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2030-01-01    
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 [1],[2] $ 35  
[1] Investment advisory and administration fees include management fees related to certain private markets products, which are determined based on known contractual committed capital outstanding at March 31, 2026 and 2025. Revenue attributed to future periods could be subject to change due to a change in business activities (e.g., post-investment period) and actual amounts could differ from amounts disclosed.
[2] The Company elected practical expedients to exclude amounts related to (a) performance obligations with an original duration of one year or less, and (b) variable consideration related to future service periods.