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Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Additional Information (Detail) - USD ($)
36 Months Ended
Dec. 31, 2007
Mar. 31, 2022
Dec. 31, 2021
Guarantor Obligations [Line Items]      
Deferred fees   $ 4,000,000 $ 4,000,000
Carrying value of swap   1,463,311,000,000 1,395,345,000,000
Estimate of reasonably possible loss   150,000,000  
Pledged assets not separately reported, trading assets   1,943,000,000 1,773,000,000
Collateral accepted under security resale agreements, fair value   10,798,000,000 12,848,000,000
Collateral accepted under security repurchase agreements but not reported on the balance sheet that can be sold or repledged, fair value   10,798,000,000 12,848,000,000
Collateral accepted under security repurchase agreements that has been sold or repledged under repurchase agreements or to cover short sales   2,125,000,000 538,000,000
Obligation to Repurchase Receivables Sold      
Guarantor Obligations [Line Items]      
Estimated repurchase liability   11,000,000 3,000,000
Obligation to Repurchase Receivables Sold | Minimum      
Guarantor Obligations [Line Items]      
Estimate of reasonably possible loss   0  
Obligation to Repurchase Receivables Sold | Maximum      
Guarantor Obligations [Line Items]      
Estimate of reasonably possible loss   30,000,000  
HSBC Securities      
Guarantor Obligations [Line Items]      
Whole loan securitization $ 24,000,000,000    
HSBC Securities | Mortgage Securitization Activity Related Litigation      
Guarantor Obligations [Line Items]      
Mortgage securitization outstanding loan purchase and sold   2,700,000,000 2,700,000,000
Securities available-for-sale ("AFS")      
Guarantor Obligations [Line Items]      
Securities pledged as collateral that can be sold or repledged by the secured party, fair value   3,359,000,000 2,410,000,000
Trading assets      
Guarantor Obligations [Line Items]      
Pledged assets not separately reported, trading assets   1,943,000,000 1,749,000,000
Other liabilities      
Guarantor Obligations [Line Items]      
Allowance for credit losses on unfunded standby letters of credit   13,000,000 14,000,000
Other liabilities | Standby Letters of Credit      
Guarantor Obligations [Line Items]      
Deferred fees   54,000,000 51,000,000
Swap      
Guarantor Obligations [Line Items]      
Carrying value of swap   $ 27,000,000 $ 38,000,000