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Loans - Credit Risk Profile of Commercial Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans $ 66,409 $ 68,553
Commercial Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,066  
2019 5,719  
2018 3,827  
2017 2,110  
2016 657  
Prior 13,650  
Revolving Loans 17,380  
Revolving Loans Converted to Term Loans 374  
Total loans 45,783 48,211
Commercial Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 549  
2019 3,909  
2018 3,114  
2017 1,413  
2016 268  
Prior 1,927  
Revolving Loans 81  
Revolving Loans Converted to Term Loans 22  
Total loans 11,283 11,501
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,182  
2019 662  
2018 265  
2017 354  
2016 166  
Prior 4,342  
Revolving Loans 7,841  
Revolving Loans Converted to Term Loans 352  
Total loans [1] 15,164 13,479
Commercial Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 283  
2019 724  
2018 207  
2017 231  
2016 105  
Prior 6,681  
Revolving Loans 7,274  
Revolving Loans Converted to Term Loans 0  
Total loans [2] 15,505 17,915
Commercial Loans [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 52  
2019 424  
2018 241  
2017 112  
2016 118  
Prior 700  
Revolving Loans 2,184  
Revolving Loans Converted to Term Loans 0  
Total loans 3,831 5,316
Commercial Loans [Member] | Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 966  
2019 2,468  
2018 1,435  
2017 914  
2016 346  
Prior 7,999  
Revolving Loans 9,470  
Revolving Loans Converted to Term Loans 73  
Total loans 23,671 29,991
Commercial Loans [Member] | Investment Grade [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 357  
2019 1,368  
2018 1,216  
2017 529  
2016 180  
Prior 832  
Revolving Loans 6  
Revolving Loans Converted to Term Loans 0  
Total loans 4,488 6,332
Commercial Loans [Member] | Investment Grade [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 346  
2019 267  
2018 44  
2017 49  
2016 27  
Prior 1,795  
Revolving Loans 2,415  
Revolving Loans Converted to Term Loans 73  
Total loans 5,016 6,029
Commercial Loans [Member] | Investment Grade [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 218  
2019 691  
2018 49  
2017 231  
2016 29  
Prior 4,769  
Revolving Loans 5,228  
Revolving Loans Converted to Term Loans 0  
Total loans 11,215 12,981
Commercial Loans [Member] | Investment Grade [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 45  
2019 142  
2018 126  
2017 105  
2016 110  
Prior 603  
Revolving Loans 1,821  
Revolving Loans Converted to Term Loans 0  
Total loans 2,952 4,649
Commercial Loans [Member] | Noninvestment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,100  
2019 3,251  
2018 2,392  
2017 1,196  
2016 311  
Prior 5,651  
Revolving Loans 7,910  
Revolving Loans Converted to Term Loans 301  
Total loans 22,112 18,220
Commercial Loans [Member] | Noninvestment Grade [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 192  
2019 2,541  
2018 1,898  
2017 884  
2016 88  
Prior 1,095  
Revolving Loans 75  
Revolving Loans Converted to Term Loans 22  
Total loans 6,795 5,169
Commercial Loans [Member] | Noninvestment Grade [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 836  
2019 395  
2018 221  
2017 305  
2016 139  
Prior 2,547  
Revolving Loans 5,426  
Revolving Loans Converted to Term Loans 279  
Total loans 10,148 7,450
Commercial Loans [Member] | Noninvestment Grade [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 65  
2019 33  
2018 158  
2017 0  
2016 76  
Prior 1,912  
Revolving Loans 2,046  
Revolving Loans Converted to Term Loans 0  
Total loans 4,290 4,934
Commercial Loans [Member] | Noninvestment Grade [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 7  
2019 282  
2018 115  
2017 7  
2016 8  
Prior 97  
Revolving Loans 363  
Revolving Loans Converted to Term Loans 0  
Total loans $ 879 $ 667
[1] Includes loans funded under the Paycheck Protection Program ("PPP") which totaled $1,186 million at September 30, 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.