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Transactions with Affiliated Funds - Fees Earned from Affiliated Funds (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Transactions With Affiliated Funds [Abstract]        
Fees earned from funds $ 1,476 $ 1,386 $ 4,381 $ 3,905