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	Dec. 31, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Total, Carrying Value	$ 54	$ 40
Credit derivatives, Notional/Maximum Exposure to Loss	10,726	10,649
Total, Notional/Maximum Exposure to Loss	12,097	13,213
Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Carrying Value	54	40
Credit derivatives, Notional/Maximum Exposure to Loss	2,992	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	5,785	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	3,320	3,264
Affiliated Entity | Sell-protection Credit Derivatives
Guarantor Obligations [Line Items]
Credit derivatives, Notional/Maximum Exposure to Loss	1,483	2,744
Affiliated Entity | Financial and performance standby letters of credit
Guarantor Obligations [Line Items]
Standby letters of credit, Notional/Maximum Exposure to Loss	$ 2,080	$ 2,069