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Loans - Summary of Past Due Status of Loans (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More $ 923 $ 948  
Current [1] 71,640 72,927  
Total loans 72,563 73,875 $ 82,917
Commercial Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 134 143  
Current [1] 52,901 54,073  
Total loans 53,035 54,216  
Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 36 23  
Current [1] 10,497 10,867  
Total loans 10,533 10,890 10,000
Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 30 44  
Current [1] 12,474 14,036  
Total loans 12,504 14,080 14,365
Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 25 65  
Current [1] 20,063 23,416  
Total loans 20,088 [2],[3] 23,481 [2],[3] 29,905
Commercial Loans [Member] | Other Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 43 11  
Current [1] 9,867 5,754  
Total loans 9,910 [2] 5,765 [2] 8,183
Consumer Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 789 805  
Current [1] 18,739 18,854  
Total loans 19,528 19,659  
Consumer Loans [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 713 719  
Current [1] 16,560 16,462  
Total loans 17,273 17,181 17,758
Consumer Loans [Member] | Home Equity Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 47 53  
Current [1] 1,144 1,355  
Total loans 1,191 [4] 1,408 1,600
Consumer Loans [Member] | Credit Cards [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 17 19  
Current [1] 704 669  
Total loans 721 [5] 688 699
Consumer Loans [Member] | Other consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Days Past Due, 30 Days or More 12 14  
Current [1] 331 368  
Total loans 343 382 $ 407
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 488 485  
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 95 57  
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 27 17  
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 25 35  
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 1  
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 43 4  
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 393 428  
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 369 402  
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 11 10  
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 8 9  
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 7  
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 435 463  
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 39 86  
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 9 6  
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 5 9  
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 25 64  
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 7  
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 396 377  
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 344 317  
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 36 43  
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 9 10  
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 $ 7 $ 7  
[1] Loans less than 30 days past due are presented as current.
[2] During 2017, in conjunction with the creation of the new Corporate Center segment as discussed further in Note 22, "Business Segments," we reclassified loans to HSBC affiliates from global banking to other commercial and revised prior periods to conform with the current year presentation. As a result, other commercial includes loans to HSBC affiliates which totaled $6,750 million and $3,274 million at December 31, 2017 and 2016, respectively. All tables below have been restated to reflect this reclassification, as applicable. See Note 21, "Related Party Transactions," for additional information regarding loans to HSBC affiliates.
[3] 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.
[4] Home equity mortgage maturities reflect estimates based on historical payment patterns.
[5] As credit card receivables do not have stated maturities, the table reflects estimates based on historical payment patterns.