Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Carrying Value and Contractual Amounts of our Sell Protection Credit Derivatives and Major Off-Balance Sheet Guarantee Arrangements (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Total, Carrying Value	$ (34)	$ 7
Credit derivatives, Notional/Maximum Exposure to Loss	7,378	2,675
Total, Notional/Maximum Exposure to Loss	12,274	10,474
Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Carrying Value		7
Credit derivatives, Carrying Value	(34)
Credit derivatives, Notional/Maximum Exposure to Loss	3,402	2,174
Financial standby letters of credit, net of participations
Guarantor Obligations [Line Items]
Standby letters of credit, Carrying Value	0	0
Standby letters of credit, Notional/Maximum Exposure to Loss	5,670	5,339
Performance standby letters of credit, net of participations
Guarantor Obligations [Line Items]
Standby letters of credit, Carrying Value	0	0
Standby letters of credit, Notional/Maximum Exposure to Loss	3,202	2,961
Affiliated Entity | Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	2,078	1,591
Affiliated Entity | Financial and performance standby letters of credit
Guarantor Obligations [Line Items]
Standby letters of credit, Notional/Maximum Exposure to Loss	$ 1,995	$ 1,969