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Revenue - Schedule of Estimated Technology Services and Subscription Revenue Expected to Be Recognized in Future, Related to Unsatisfied Portion of Performance Obligations (Detail) - Technology Services and Subscription Revenue [Member] - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investment Advisory Administration Fees and Securities Lending Revenue and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation [1],[2] $ 497 $ 334
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01    
Schedule of Investment Advisory Administration Fees and Securities Lending Revenue and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   1 year
Revenue, Remaining Performance Obligation [1],[2]   $ 134
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01    
Schedule of Investment Advisory Administration Fees and Securities Lending Revenue 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] $ 208 $ 81
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01    
Schedule of Investment Advisory Administration Fees and Securities Lending Revenue 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] $ 121 $ 50
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01    
Schedule of Investment Advisory Administration Fees and Securities Lending Revenue 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] $ 73 $ 69
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01    
Schedule of Investment Advisory Administration Fees and Securities Lending Revenue and Performance Fees by Type [line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year  
Revenue, Remaining Performance Obligation [1],[2] $ 95  
[1] Technology services and subscription revenue includes upfront payments from customers, which the Company recognizes as services are performed. Revenue attributed to future periods could be subject to change due to a change in business activities and actual amounts could differ from amounts disclosed in the table above.
[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.