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	Jun. 30, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Total, Carrying Value	$ 24	$ 40
Credit derivatives, Notional/Maximum Exposure to Loss	6,624	10,649
Total, Notional/Maximum Exposure to Loss	11,849	13,213
Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Carrying Value	24	40
Credit derivatives, Notional/Maximum Exposure to Loss	2,783	3,949
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	5,777	6,000
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	3,289	3,264
Affiliated Entity | Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	1,886	2,744
Affiliated Entity | Financial and performance standby letters of credit
Guarantor Obligations [Line Items]
Standby letters of credit, Notional/Maximum Exposure to Loss	$ 2,118	$ 2,069