Securitization Activities - Amount of Financial Assets Securitized and Cash Flows Received on Retained Interests (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Transfers and Servicing [Abstract]
Residential mortgages	$ 26,717	$ 29,048	$ 20,167
Commercial mortgages	13,935	18,396	14,904
Other financial assets	3,617	4,377	1,775
Total financial assets securitized	44,269	51,821	36,846
Retained interests cash flows	$ 551	$ 513	$ 331

Cash flows between transferee and transferor in payment of the transferor's beneficial interest related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction.

No definition available.

Name:	us-gaap_CashFlowsBetweenTransferorAndTransfereeBeneficialInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration