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Loans - Summary of Criticized Assets for Commercial Loans (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 67,338 $ 72,563 $ 69,588
Commercial Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 47,739 53,035  
Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 11,054 10,533 10,802
Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 12,818 12,504 13,152
Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 19,289 [1],[2] 20,088 [1],[2] 22,527
Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 4,578 [2] 9,910 [2] $ 3,515
Commercial Loans [Member] | Criticized [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3,210 3,782  
Commercial Loans [Member] | Criticized [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 572 585  
Commercial Loans [Member] | Criticized [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 945 1,040  
Commercial Loans [Member] | Criticized [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,682 2,146  
Commercial Loans [Member] | Criticized [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 11 11  
Commercial Loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,300 1,407  
Commercial Loans [Member] | Special Mention [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 428 467  
Commercial Loans [Member] | Special Mention [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 452 477  
Commercial Loans [Member] | Special Mention [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 409 452  
Commercial Loans [Member] | Special Mention [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 11 11  
Commercial Loans [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,807 2,248  
Commercial Loans [Member] | Substandard [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 141 117  
Commercial Loans [Member] | Substandard [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 456 519  
Commercial Loans [Member] | Substandard [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 1,210 1,612  
Commercial Loans [Member] | Substandard [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 0 0  
Commercial Loans [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 103 127  
Commercial Loans [Member] | Doubtful [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 3 1  
Commercial Loans [Member] | Doubtful [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 37 44  
Commercial Loans [Member] | Doubtful [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 63 82  
Commercial Loans [Member] | Doubtful [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 0 $ 0  
[1] Represents large multinational firms including globally focused U.S. corporate and financial institutions, U.S. dollar lending to multinational banking clients managed by HSBC on a global basis and complex large business clients supported by Global Banking and Markets relationship managers.
[2] ncludes loans to HSBC affiliates which totaled $1,920 million and $6,750 million at March 31, 2018 and December 31, 2017, respectively. See Note 14, "Related Party Transactions," for additional information regarding loans to HSBC affiliates.