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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
Mar. 31, 2022
Dec. 31, 2021
Guarantor Obligations [Line Items]    
Carrying Value $ 104 $ 7
Notional / Maximum Exposure to Loss 14,683 10,474
Credit derivatives    
Guarantor Obligations [Line Items]    
Carrying Value 104 7
Notional / Maximum Exposure to Loss 6,319 2,174
Financial standby letters of credit, net of participations    
Guarantor Obligations [Line Items]    
Carrying Value 0 0
Notional / Maximum Exposure to Loss 5,462 5,339
Performance standby letters of credit, net of participations    
Guarantor Obligations [Line Items]    
Carrying Value 0 0
Notional / Maximum Exposure to Loss 2,902 2,961
Affiliated Entity | Credit derivatives    
Guarantor Obligations [Line Items]    
Notional / Maximum Exposure to Loss 2,314 1,591
Affiliated Entity | Financial and performance standby letters of credit    
Guarantor Obligations [Line Items]    
Notional / Maximum Exposure to Loss $ 1,989 $ 1,969