Transactions with Affiliated Funds - Fees Receivable from Affiliated Funds and the Aggregate Carrying Value of the Firm's Interests in these Funds (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Transactions With Affiliated Funds [Abstract]
Fees receivable from funds	$ 901	$ 780
Aggregate carrying value of interests in funds	$ 4,875	$ 5,490