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Loans - Status of Loan Portfolios (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] | Performing Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 2,509  
2019 5,307  
2018 3,433  
2017 1,979  
2016 638  
Prior 11,732  
Revolving Loans 15,115  
Revolving Loans Converted to Term Loans 342  
Total loans 41,055 47,973
Commercial Loans [Member] | Performing Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 545  
2019 3,775  
2018 2,775  
2017 1,368  
2016 264  
Prior 1,594  
Revolving Loans 79  
Revolving Loans Converted to Term Loans 20  
Total loans 10,420 11,495
Commercial Loans [Member] | Performing Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1,079  
2019 606  
2018 253  
2017 275  
2016 151  
Prior 3,485  
Revolving Loans 7,145  
Revolving Loans Converted to Term Loans 322  
Total loans 13,316 13,396
Commercial Loans [Member] | Performing Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 507  
2019 495  
2018 190  
2017 231  
2016 104  
Prior 6,023  
Revolving Loans 5,632  
Revolving Loans Converted to Term Loans 0  
Total loans 13,182 17,766
Commercial Loans [Member] | Performing 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] | Nonaccrual Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 15  
2018 36  
2017 60  
2016 1  
Prior 150  
Revolving Loans 281  
Revolving Loans Converted to Term Loans 0  
Total loans 544 237
Commercial Loans [Member] | Nonaccrual Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 24  
2017 0  
2016 0  
Prior 20  
Revolving Loans 0  
Revolving Loans Converted to Term Loans 0  
Total loans 44 6
Commercial Loans [Member] | Nonaccrual Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 1  
2019 15  
2018 12  
2017 60  
2016 1  
Prior 3  
Revolving Loans 71  
Revolving Loans Converted to Term Loans 0  
Total loans 163 82
Commercial Loans [Member] | Nonaccrual Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 127  
Revolving Loans 210  
Revolving Loans Converted to Term Loans 0  
Total loans 337 149
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 0  
Revolving Loans Converted to Term Loans 0  
Total loans 0 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 0  
Revolving Loans Converted to Term Loans 0  
Total loans 0 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 4,666  
2019 2,566  
2018 1,465  
2017 1,694  
2016 1,985  
Prior 6,991  
Revolving Loans 1,122  
Total loans 20,489 20,342
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,529  
2019 2,476  
2018 1,431  
2017 1,658  
2016 1,930  
Prior 6,353  
Revolving Loans 0  
Total loans 18,377 17,801
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 50  
2019 51  
2018 34  
2017 35  
2016 47  
Prior 510  
Revolving Loans 0  
Total loans 727 [3] 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 1,066  
Total loans 1,066 [4] 1,405
Consumer Loans [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 87  
2019 39  
2018 0  
2017 1  
2016 8  
Prior 128  
Revolving Loans 56  
Total loans [5] 319 283
Consumer Loans [Member] | Performing Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,628  
2019 2,459  
2018 1,371  
2017 1,607  
2016 1,905  
Prior 6,255  
Revolving Loans 1,101  
Total loans 19,326 19,886
Consumer Loans [Member] | Performing Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 4,491  
2019 2,369  
2018 1,338  
2017 1,572  
2016 1,852  
Prior 5,676  
Revolving Loans 0  
Total loans 17,298 17,420
Consumer Loans [Member] | Performing Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 50  
2019 51  
2018 33  
2017 34  
2016 45  
Prior 451  
Revolving Loans 0  
Total loans 664 807
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 1,047  
Total loans 1,047 1,381
Consumer Loans [Member] | Performing Loans [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 87  
2019 39  
2018 0  
2017 1  
2016 8  
Prior 128  
Revolving Loans 54  
Total loans 317 278
Consumer Loans [Member] | Nonaccrual Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 38  
2019 107  
2018 94  
2017 87  
2016 80  
Prior 736  
Revolving Loans 0  
Total loans 1,142 427
Consumer Loans [Member] | Nonaccrual Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 38  
2019 107  
2018 93  
2017 86  
2016 78  
Prior 677  
Revolving Loans 0  
Total loans 1,079 381
Consumer Loans [Member] | Nonaccrual Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 0  
2019 0  
2018 1  
2017 1  
2016 2  
Prior 59  
Revolving Loans 0  
Total loans 63 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 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.
[3] Home equity mortgage maturities reflect estimates based on historical payment patterns.
[4] As credit card receivables do not have stated maturities, the table reflects an average estimate based on historical payment patterns
[5] Includes certain student loans that we have elected to designate under the fair value option and are therefore carried at fair value, which totaled $32 million at December 31, 2020. See Note 16, "Fair Value Option," for further details.