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Loans - Status of Loan Portfolios (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] | Performing Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,066  
2019 5,704  
2018 3,810  
2017 1,920  
2016 656  
Prior 13,620  
Revolving Loans 17,032  
Revolving Loans Converted to Term Loans 373  
Total loans 45,181 47,973
Commercial Loans [Member] | Performing 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 267  
Prior 1,915  
Revolving Loans 81  
Revolving Loans Converted to Term Loans 22  
Total loans 11,270 11,495
Commercial Loans [Member] | Performing Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,182  
2019 647  
2018 252  
2017 295  
2016 166  
Prior 4,324  
Revolving Loans 7,721  
Revolving Loans Converted to Term Loans 351  
Total loans 14,938 13,396
Commercial Loans [Member] | Performing Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 283  
2019 724  
2018 203  
2017 100  
2016 105  
Prior 6,681  
Revolving Loans 7,046  
Revolving Loans Converted to Term Loans 0  
Total loans 15,142 17,766
Commercial Loans [Member] | Performing 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] | Nonaccrual Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 15  
2018 17  
2017 190  
2016 1  
Prior 30  
Revolving Loans 347  
Revolving Loans Converted to Term Loans 1  
Total loans 601 237
Commercial Loans [Member] | Nonaccrual Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 1  
Prior 12  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 13 6
Commercial Loans [Member] | Nonaccrual Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 15  
2018 13  
2017 59  
2016 0  
Prior 18  
Revolving Loans 119  
Revolving Loans Converted to Term Loans 1  
Total loans 225 82
Commercial Loans [Member] | Nonaccrual Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 4  
2017 131  
2016 0  
Prior 0  
Revolving Loans 228  
Revolving Loans Converted to Term Loans 0  
Total loans 363 149
Commercial Loans [Member] | Nonaccrual Loans [Member] | Other Commercial [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] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 1  
Revolving Loans Converted to Term Loans 0  
Total loans 1 1
Commercial Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [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] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 1  
Revolving Loans Converted to Term Loans 0  
Total loans 1 1
Commercial Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Global Banking [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] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Other Commercial [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
Consumer Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,661  
2019 2,737  
2018 1,572  
2017 1,826  
2016 2,137  
Prior 7,527  
Revolving Loans 1,166  
Total loans 20,626 20,342
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,546  
2019 2,638  
2018 1,531  
2017 1,789  
2016 2,084  
Prior 6,851  
Revolving Loans 0  
Total loans 18,439 17,801
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 42  
2019 54  
2018 40  
2017 37  
2016 48  
Prior 544  
Revolving Loans 0  
Total loans 765 853
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 1,107  
Total loans 1,107 1,405
Consumer Loans [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 73  
2019 45  
2018 1  
2017 0  
2016 5  
Prior 132  
Revolving Loans 59  
Total loans [3] 315 283
Consumer Loans [Member] | Performing Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,641  
2019 2,702  
2018 1,544  
2017 1,788  
2016 2,106  
Prior 7,084  
Revolving Loans 1,145  
Total loans 20,010 19,886
Consumer Loans [Member] | Performing Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,526  
2019 2,603  
2018 1,504  
2017 1,751  
2016 2,053  
Prior 6,449  
Revolving Loans 0  
Total loans 17,886 17,420
Consumer Loans [Member] | Performing Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 42  
2019 54  
2018 39  
2017 37  
2016 48  
Prior 503  
Revolving Loans 0  
Total loans 723 807
Consumer Loans [Member] | Performing Loans [Member] | Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 1,088  
Total loans 1,088 1,381
Consumer Loans [Member] | Performing Loans [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 73  
2019 45  
2018 1  
2017 0  
2016 5  
Prior 132  
Revolving Loans 57  
Total loans 313 278
Consumer Loans [Member] | Nonaccrual Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 20  
2019 35  
2018 28  
2017 38  
2016 31  
Prior 443  
Revolving Loans 0  
Total loans 595 427
Consumer Loans [Member] | Nonaccrual Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 20  
2019 35  
2018 27  
2017 38  
2016 31  
Prior 402  
Revolving Loans 0  
Total loans 553 381
Consumer Loans [Member] | Nonaccrual Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 1  
2017 0  
2016 0  
Prior 41  
Revolving Loans 0  
Total loans 42 46
Consumer Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 21  
Total loans 21 29
Consumer Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 19  
Total loans 19 24
Consumer Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 2  
Total loans $ 2 $ 5
[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.
[3] Includes certain student loans that we have elected to designate under the fair value option and are therefore carried at fair value, which totaled $34 million at September 30, 2020. See Note 10, "Fair Value Option," for further details.