Securitization Activities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Assets securitized in a non-cash exchange for loans and investments	$ 382	$ 266	$ 781	$ 679
Net asset related to other continuing involvement	115		115		$ 81
Notional amount related to other continuing involvement	1,800		1,800		1,810
Fair value of retained interests	4,830		4,830		3,570
Other retained interests
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Fair value of retained interests	408		$ 408		$ 360
Weighted average life (years)			6 years 1 month 6 days		3 years 7 months 6 days
Maximum exposure to adverse changes in the value of other retained interests	$ 425		$ 425		$ 360