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Loans - Summary of Criticized Assets for Commercial Loans (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans $ 62,088 $ 68,553
Commercial Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,510  
2019 5,322  
2018 3,469  
2017 2,039  
2016 639  
Prior 11,882  
Revolving Loans 15,396  
Revolving Loans Converted to Term Loans 342  
Total loans 41,599 48,211
Commercial Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 545  
2019 3,775  
2018 2,799  
2017 1,368  
2016 264  
Prior 1,614  
Revolving Loans 79  
Revolving Loans Converted to Term Loans 20  
Total loans 10,464 11,501
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,080  
2019 621  
2018 265  
2017 335  
2016 152  
Prior 3,488  
Revolving Loans 7,216  
Revolving Loans Converted to Term Loans 322  
Total loans [1] 13,479 13,479
Commercial Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 507  
2019 495  
2018 190  
2017 231  
2016 104  
Prior 6,150  
Revolving Loans 5,842  
Revolving Loans Converted to Term Loans 0  
Total loans [2] 13,519 17,915
Commercial Loans [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 378  
2019 431  
2018 215  
2017 105  
2016 119  
Prior 630  
Revolving Loans 2,259  
Revolving Loans Converted to Term Loans 0  
Total loans 4,137 5,316
Commercial Loans [Member] | Criticized [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 18  
2019 607  
2018 231  
2017 395  
2016 126  
Prior 1,604  
Revolving Loans 1,867  
Revolving Loans Converted to Term Loans 49  
Total loans 4,897 2,001
Commercial Loans [Member] | Criticized [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 492  
2018 115  
2017 340  
2016 85  
Prior 523  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 1,555 719
Commercial Loans [Member] | Criticized [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 18  
2019 115  
2018 68  
2017 55  
2016 41  
Prior 612  
Revolving Loans 1,092  
Revolving Loans Converted to Term Loans 49  
Total loans 2,050 876
Commercial Loans [Member] | Criticized [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 48  
2017 0  
2016 0  
Prior 355  
Revolving Loans 735  
Revolving Loans Converted to Term Loans 0  
Total loans 1,138 395
Commercial Loans [Member] | Criticized [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 114  
Revolving Loans 40  
Revolving Loans Converted to Term Loans 0  
Total loans 154 11
Commercial Loans [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 17  
2019 377  
2018 158  
2017 203  
2016 95  
Prior 1,013  
Revolving Loans 738  
Revolving Loans Converted to Term Loans 48  
Total loans 2,649 1,178
Commercial Loans [Member] | Special Mention [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 306  
2018 115  
2017 171  
2016 85  
Prior 437  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 1,114 516
Commercial Loans [Member] | Special Mention [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 17  
2019 71  
2018 43  
2017 32  
2016 10  
Prior 390  
Revolving Loans 600  
Revolving Loans Converted to Term Loans 48  
Total loans 1,211 467
Commercial Loans [Member] | Special Mention [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 142  
Revolving Loans 98  
Revolving Loans Converted to Term Loans 0  
Total loans 240 184
Commercial Loans [Member] | Special Mention [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 44  
Revolving Loans 40  
Revolving Loans Converted to Term Loans 0  
Total loans 84 11
Commercial Loans [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 230  
2018 73  
2017 192  
2016 31  
Prior 468  
Revolving Loans 912  
Revolving Loans Converted to Term Loans 1  
Total loans 1,908 785
Commercial Loans [Member] | Substandard [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 186  
2018  
2017 169  
2016 0  
Prior 86  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 441 203
Commercial Loans [Member] | Substandard [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 44  
2018 25  
2017 23  
2016 31  
Prior 181  
Revolving Loans 435  
Revolving Loans Converted to Term Loans 1  
Total loans 741 386
Commercial Loans [Member] | Substandard [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 48  
2017 0  
2016 0  
Prior 131  
Revolving Loans 477  
Revolving Loans Converted to Term Loans 0  
Total loans 656 196
Commercial Loans [Member] | Substandard [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 70  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 70 0
Commercial Loans [Member] | Doubtful [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 123  
Revolving Loans 217  
Revolving Loans Converted to Term Loans 0  
Total loans 340 38
Commercial Loans [Member] | Doubtful [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 0 0
Commercial Loans [Member] | Doubtful [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019  
2018  
2017 0  
2016 0  
Prior 41  
Revolving Loans 57  
Revolving Loans Converted to Term Loans 0  
Total loans 98 23
Commercial Loans [Member] | Doubtful [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019  
2018  
2017 0  
2016 0  
Prior 82  
Revolving Loans 160  
Revolving Loans Converted to Term Loans 0  
Total loans 242 15
Commercial Loans [Member] | Doubtful [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019  
2018  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans $ 0 $ 0
[1] Includes loans funded under the PPP which totaled $1,043 million at December 31, 2020. PPP loans are fully guaranteed by the Small Business Administration, if certain conditions are met.
[2] 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.