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Loans - Credit Risk Profile of 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
Investment Grade [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans [3] 31,092 34,767  
Investment Grade [Member] | Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans [3] 8,245 7,456  
Investment Grade [Member] | Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans [3] 5,762 5,752  
Investment Grade [Member] | Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans [3] 13,707 13,218  
Investment Grade [Member] | Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans [3] 3,378 8,341  
Noninvestment Grade [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 16,647 18,268  
Noninvestment Grade [Member] | Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 2,809 3,077  
Noninvestment Grade [Member] | Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 7,056 6,752  
Noninvestment Grade [Member] | Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 5,582 6,870  
Noninvestment Grade [Member] | Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total loans $ 1,200 $ 1,569  
[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.
[3] Investment grade includes commercial loans with credit ratings of at least BBB- or above or the equivalent based on our internal credit rating system.