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Loans - Summary of Criticized Assets for Commercial Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 77,625 $ 82,917 $ 84,942
Commercial Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 58,032 62,453  
Commercial Loans [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 10,958 10,000 12,096
Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 17,665 19,116 19,514
Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 26,414 [1] 29,969 [1] 29,808
Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,995 3,368 $ 3,334
Commercial Loans [Member] | Criticized [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 6,223 5,529  
Commercial Loans [Member] | Criticized [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 609 426  
Commercial Loans [Member] | Criticized [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,695 1,683  
Commercial Loans [Member] | Criticized [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,912 3,381  
Commercial Loans [Member] | Criticized [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7 39  
Commercial Loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,288 2,250  
Commercial Loans [Member] | Special Mention [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 445 239  
Commercial Loans [Member] | Special Mention [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 803 941  
Commercial Loans [Member] | Special Mention [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,040 1,069  
Commercial Loans [Member] | Special Mention [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 1  
Commercial Loans [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,431 3,214  
Commercial Loans [Member] | Substandard [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 159 187  
Commercial Loans [Member] | Substandard [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 839 690  
Commercial Loans [Member] | Substandard [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,427 2,300  
Commercial Loans [Member] | Substandard [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 6 37  
Commercial Loans [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 504 65  
Commercial Loans [Member] | Doubtful [Member] | Construction and Other Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 5 0  
Commercial Loans [Member] | Doubtful [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 53 52  
Commercial Loans [Member] | Doubtful [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 445 12  
Commercial Loans [Member] | Doubtful [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 1 $ 1  
[1] Represents large multinational firms including globally focused U.S. corporate and financial institutions and U.S. dollar lending to multinational banking customers managed by HSBC on a global basis. Also includes loans to HSBC affiliates which totaled $4,463 million and $4,815 million at September 30, 2016 and December 31, 2015, respectively. See Note 14, "Related Party Transactions," for additional information regarding loans to HSBC affiliates.