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Loans - Summary of Past Due Status of Loans (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More $ 823 $ 923  
Current 66,515 71,640  
Total loans 67,338 72,563 $ 69,588
Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 102 134  
Current 47,637 52,901  
Total loans 47,739 53,035  
Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 52 36  
Current 11,002 10,497  
Total loans 11,054 10,533 10,802
Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 38 30  
Current 12,780 12,474  
Total loans 12,818 12,504 13,152
Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 0 25  
Current 19,289 20,063  
Total loans 19,289 [1],[2] 20,088 [1],[2] 22,527
Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 12 43  
Current 4,566 9,867  
Total loans 4,578 [2] 9,910 [2] 3,515
Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 721 789  
Current 18,878 18,739  
Total loans 19,599 19,528  
Consumer Loans [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 649 713  
Current 16,676 16,560  
Total loans 17,325 17,273 17,219
Consumer Loans [Member] | Home Equity Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 44 47  
Current 1,095 1,144  
Total loans 1,139 1,191 1,344
Consumer Loans [Member] | Credit Cards [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 18 17  
Current 752 704  
Total loans 770 721 646
Consumer Loans [Member] | Other consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 10 12  
Current 355 331  
Total loans 365 343 $ 383
Financing Receivables, 30 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 452 488  
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 90 95  
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 42 27  
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 36 25  
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 0 0  
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 12 43  
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 362 393  
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 337 369  
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loans [Member] | Home Equity Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 10 11  
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loans [Member] | Credit Cards [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 10 8  
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Loans [Member] | Other consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 5 5  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 371 435  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 12 39  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 10 9  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 2 5  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 0 25  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 359 396  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 312 344  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member] | Home Equity Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 34 36  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member] | Credit Cards [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 8 9  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member] | Other consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More $ 5 $ 7  
[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.