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Guarantee Arrangements, Pledged Assets and Repurchase Agreements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 36 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Dec. 31, 2007
Guarantor Obligations [Line Items]          
Notional/maximum exposure to loss $ 56,739   $ 66,721 $ 56,739  
Carrying value of swap 4,252,577   4,135,130 4,252,577  
Carrying value 358   627 358  
Collateral accepted under security resale agreements, fair value 25,969   30,784 25,969  
Collateral accepted under security repurchase agreements but not reported on the balance sheet that can be sold or repledged, fair value 23,329   29,835 23,329  
Collateral accepted under security repurchase agreements that has been sold or repledged under repurchase agreements or to cover short sales 7,373   769 7,373  
HSBC Securities [Member]          
Guarantor Obligations [Line Items]          
Whole loan securitization         $ 24,000
Securities available-for-sale [Member]          
Guarantor Obligations [Line Items]          
Securities pledged as collateral that can be sold or repledged by the secured party, fair value 3,680   892 3,680  
Trading Securities [Member]          
Guarantor Obligations [Line Items]          
Securities pledged as collateral that can be sold or repledged by the secured party, fair value 3,889   2,772 3,889  
Financial standby letters of credit, net of participations [Member]          
Guarantor Obligations [Line Items]          
Notional/maximum exposure to loss [1],[2] 4,961   5,423 4,961  
Carrying value [1],[2] 0   0 0  
Performance (non-financial) guarantees, net of participations [Member]          
Guarantor Obligations [Line Items]          
Notional/maximum exposure to loss [1],[2] 2,995   2,969 2,995  
Carrying value [1],[2] 0   0 0  
Obligation to Repurchase Receivables Sold [Member]          
Guarantor Obligations [Line Items]          
Outstanding repurchase demands 3   6 3  
Mortgage Securitization Activity Related Litigation [Member] | HSBC Securities [Member]          
Guarantor Obligations [Line Items]          
Mortgage securitization outstanding loan purchase and sold 4,400   4,600 4,400  
Other liabilities [Member]          
Guarantor Obligations [Line Items]          
Allowance for credit losses on unfunded standby letters of credit 23   39 23  
Other liabilities [Member] | Standby Letters of Credit [Member]          
Guarantor Obligations [Line Items]          
Deferred fees on standby letters of credit $ 49   $ 49 49  
Visa Class B Shares [Member]          
Guarantor Obligations [Line Items]          
Shares sold (shares) 1,230,039 1,161,897 638,219    
Other Income (Loss) [Member] | Visa Class B Shares [Member]          
Guarantor Obligations [Line Items]          
Gain on sale of shares sold $ 166   $ 71 312  
Swap [Member]          
Guarantor Obligations [Line Items]          
Carrying value of swap 50   $ 14 50  
Carrying value of swap related to sale during the first half of 2017 $ 35     $ 35  
[1] For standby letters of credit, maximum loss represents losses to be recognized assuming the letters of credit have been fully drawn and the obligors have defaulted with zero recovery.
[2] Includes $1,340 million and $1,315 million of both financial and performance standby letters of credit issued for the benefit of HSBC affiliates at June 30, 2017 and December 31, 2016, respectively.