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Loans - Credit Risk Profile of 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] | Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,517  
2019 1,910  
2018 1,017  
2017 688  
2016 348  
Prior 7,269  
Revolving Loans 8,718  
Revolving Loans Converted to Term Loans 47  
Total loans 21,514 29,991
Commercial Loans [Member] | Investment Grade [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 339  
2019 1,123  
2018 817  
2017 318  
2016 179  
Prior 640  
Revolving Loans 6  
Revolving Loans Converted to Term Loans 0  
Total loans 3,422 6,332
Commercial Loans [Member] | Investment Grade [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 342  
2019 147  
2018 37  
2017 34  
2016 23  
Prior 1,486  
Revolving Loans 2,499  
Revolving Loans Converted to Term Loans 47  
Total loans 4,615 6,029
Commercial Loans [Member] | Investment Grade [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 464  
2019 477  
2018 46  
2017 231  
2016 30  
Prior 4,618  
Revolving Loans 4,281  
Revolving Loans Converted to Term Loans 0  
Total loans 10,147 12,981
Commercial Loans [Member] | Investment Grade [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 372  
2019 163  
2018 117  
2017 105  
2016 116  
Prior 525  
Revolving Loans 1,932  
Revolving Loans Converted to Term Loans 0  
Total loans 3,330 4,649
Commercial Loans [Member] | Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 993  
2019 3,412  
2018 2,452  
2017 1,351  
2016 291  
Prior 4,613  
Revolving Loans 6,678  
Revolving Loans Converted to Term Loans 295  
Total loans 20,085 18,220
Commercial Loans [Member] | Noninvestment Grade [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 206  
2019 2,652  
2018 1,982  
2017 1,050  
2016 85  
Prior 974  
Revolving Loans 73  
Revolving Loans Converted to Term Loans 20  
Total loans 7,042 5,169
Commercial Loans [Member] | Noninvestment Grade [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 738  
2019 474  
2018 228  
2017 301  
2016 129  
Prior 2,002  
Revolving Loans 4,717  
Revolving Loans Converted to Term Loans 275  
Total loans 8,864 7,450
Commercial Loans [Member] | Noninvestment Grade [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 43  
2019 18  
2018 144  
2017 0  
2016 74  
Prior 1,532  
Revolving Loans 1,561  
Revolving Loans Converted to Term Loans 0  
Total loans 3,372 4,934
Commercial Loans [Member] | Noninvestment Grade [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 6  
2019 268  
2018 98  
2017 0  
2016 3  
Prior 105  
Revolving Loans 327  
Revolving Loans Converted to Term Loans 0  
Total loans $ 807 $ 667
[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.