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Loans - Status of Loan Portfolios (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total loans $ 61,526 $ 62,088
Commercial Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 207 2,510
Fiscal year before current fiscal year 2,808 5,322
Two years before current fiscal year 5,060 3,469
Three years before current fiscal year 3,446 2,039
Four years before current fiscal year 1,969 639
Prior 12,877 11,882
Revolving Loans 14,461 15,396
Revolving Loans Converted to Term Loans 324 342
Total loans 41,152 41,599
Commercial Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 545
Fiscal year before current fiscal year 563 3,775
Two years before current fiscal year 3,663 2,799
Three years before current fiscal year 2,785 1,368
Four years before current fiscal year 1,300 264
Prior 1,703 1,614
Revolving Loans 56 79
Revolving Loans Converted to Term Loans 17 20
Total loans 10,087 10,464
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 46 1,080
Fiscal year before current fiscal year 1,204 621
Two years before current fiscal year 637 265
Three years before current fiscal year 247 335
Four years before current fiscal year 318 152
Prior 4,076 3,488
Revolving Loans 6,290 7,216
Revolving Loans Converted to Term Loans 307 322
Total loans [1] 13,125 13,479
Commercial Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 117 507
Fiscal year before current fiscal year 605 495
Two years before current fiscal year 358 190
Three years before current fiscal year 199 231
Four years before current fiscal year 238 104
Prior 6,318 6,150
Revolving Loans 5,322 5,842
Revolving Loans Converted to Term Loans 0 0
Total loans [2] 13,157 13,519
Commercial Loans [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 44 378
Fiscal year before current fiscal year 436 431
Two years before current fiscal year 402 215
Three years before current fiscal year 215 105
Four years before current fiscal year 113 119
Prior 780 630
Revolving Loans 2,793 2,259
Revolving Loans Converted to Term Loans 0 0
Total loans 4,783 4,137
Commercial Loans [Member] | Performing Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 207 2,509
Fiscal year before current fiscal year 2,806 5,307
Two years before current fiscal year 5,045 3,433
Three years before current fiscal year 3,397 1,979
Four years before current fiscal year 1,912 638
Prior 12,728 11,732
Revolving Loans 14,257 15,115
Revolving Loans Converted to Term Loans 322 342
Total loans 40,674 41,055
Commercial Loans [Member] | Performing Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 545
Fiscal year before current fiscal year 563 3,775
Two years before current fiscal year 3,663 2,775
Three years before current fiscal year 2,753 1,368
Four years before current fiscal year 1,300 264
Prior 1,681 1,594
Revolving Loans 56 79
Revolving Loans Converted to Term Loans 17 20
Total loans 10,033 10,420
Commercial Loans [Member] | Performing Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 46 1,079
Fiscal year before current fiscal year 1,202 606
Two years before current fiscal year 622 253
Three years before current fiscal year 230 275
Four years before current fiscal year 261 151
Prior 4,074 3,485
Revolving Loans 6,213 7,145
Revolving Loans Converted to Term Loans 305 322
Total loans 12,953 13,316
Commercial Loans [Member] | Performing Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 117 507
Fiscal year before current fiscal year 605 495
Two years before current fiscal year 358 190
Three years before current fiscal year 199 231
Four years before current fiscal year 238 104
Prior 6,193 6,023
Revolving Loans 5,195 5,632
Revolving Loans Converted to Term Loans 0 0
Total loans 12,905 13,182
Commercial Loans [Member] | Performing Loans [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 44 378
Fiscal year before current fiscal year 436 431
Two years before current fiscal year 402 215
Three years before current fiscal year 215 105
Four years before current fiscal year 113 119
Prior 780 630
Revolving Loans 2,793 2,259
Revolving Loans Converted to Term Loans 0 0
Total loans 4,783 4,137
Commercial Loans [Member] | Nonaccrual Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 1
Fiscal year before current fiscal year 2 15
Two years before current fiscal year 15 36
Three years before current fiscal year 49 60
Four years before current fiscal year 57 1
Prior 149 150
Revolving Loans 204 281
Revolving Loans Converted to Term Loans 2 0
Total loans 478 544
Commercial Loans [Member] | Nonaccrual Loans [Member] | Real Estate, Including Construction [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 24
Three years before current fiscal year 32 0
Four years before current fiscal year 0 0
Prior 22 20
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 0
Total loans 54 44
Commercial Loans [Member] | Nonaccrual Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 1
Fiscal year before current fiscal year 2 15
Two years before current fiscal year 15 12
Three years before current fiscal year 17 60
Four years before current fiscal year 57 1
Prior 2 3
Revolving Loans 77 71
Revolving Loans Converted to Term Loans 2 0
Total loans 172 163
Commercial Loans [Member] | Nonaccrual Loans [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 125 127
Revolving Loans 127 210
Revolving Loans Converted to Term Loans 0 0
Total loans 252 337
Commercial Loans [Member] | Nonaccrual Loans [Member] | Other Commercial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 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]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 0
Total loans 0 0
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]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 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]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 0
Total loans 0 0
Commercial Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Global Banking [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 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]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 0 0
Revolving Loans Converted to Term Loans 0 0
Total loans 0 0
Consumer Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,393 4,666
Fiscal year before current fiscal year 4,420 2,566
Two years before current fiscal year 2,343 1,465
Three years before current fiscal year 1,342 1,694
Four years before current fiscal year 1,546 1,985
Prior 8,343 6,991
Revolving Loans 987 1,122
Total loans 20,374 20,489
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,365 4,529
Fiscal year before current fiscal year 4,289 2,476
Two years before current fiscal year 2,260 1,431
Three years before current fiscal year 1,308 1,658
Four years before current fiscal year 1,511 1,930
Prior 7,692 6,353
Revolving Loans 0 0
Total loans 18,425 18,377
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 3 50
Fiscal year before current fiscal year 51 51
Two years before current fiscal year 50 34
Three years before current fiscal year 33 35
Four years before current fiscal year 34 47
Prior 527 510
Revolving Loans 0 0
Total loans 698 727
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 937 1,066
Total loans 937 1,066
Consumer Loans [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 25 87
Fiscal year before current fiscal year 80 39
Two years before current fiscal year 33 0
Three years before current fiscal year 1 1
Four years before current fiscal year 1 8
Prior 124 128
Revolving Loans 50 56
Total loans [3] 314 319
Consumer Loans [Member] | Performing Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,393 4,628
Fiscal year before current fiscal year 4,373 2,459
Two years before current fiscal year 2,226 1,371
Three years before current fiscal year 1,231 1,607
Four years before current fiscal year 1,451 1,905
Prior 7,546 6,255
Revolving Loans 958 1,101
Total loans 19,178 19,326
Consumer Loans [Member] | Performing Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,365 4,491
Fiscal year before current fiscal year 4,243 2,369
Two years before current fiscal year 2,145 1,338
Three years before current fiscal year 1,198 1,572
Four years before current fiscal year 1,417 1,852
Prior 6,956 5,676
Revolving Loans 0 0
Total loans 17,324 17,298
Consumer Loans [Member] | Performing Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 3 50
Fiscal year before current fiscal year 51 51
Two years before current fiscal year 49 33
Three years before current fiscal year 32 34
Four years before current fiscal year 33 45
Prior 466 451
Revolving Loans 0 0
Total loans 634 664
Consumer Loans [Member] | Performing Loans [Member] | Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 909 1,047
Total loans 909 1,047
Consumer Loans [Member] | Performing Loans [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 25 87
Fiscal year before current fiscal year 79 39
Two years before current fiscal year 32 0
Three years before current fiscal year 1 1
Four years before current fiscal year 1 8
Prior 124 128
Revolving Loans 49 54
Total loans 311 317
Consumer Loans [Member] | Nonaccrual Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 38
Fiscal year before current fiscal year 46 107
Two years before current fiscal year 116 94
Three years before current fiscal year 111 87
Four years before current fiscal year 95 80
Prior 797 736
Revolving Loans 0 0
Total loans 1,165 1,142
Consumer Loans [Member] | Nonaccrual Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 38
Fiscal year before current fiscal year 46 107
Two years before current fiscal year 115 93
Three years before current fiscal year 110 86
Four years before current fiscal year 94 78
Prior 736 677
Revolving Loans 0 0
Total loans 1,101 1,079
Consumer Loans [Member] | Nonaccrual Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 1 1
Three years before current fiscal year 1 1
Four years before current fiscal year 1 2
Prior 61 59
Revolving Loans 0 0
Total loans 64 63
Consumer Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 1 0
Two years before current fiscal year 1 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 29 21
Total loans 31 21
Consumer Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 28 19
Total loans 28 19
Consumer Loans [Member] | Nonperforming Loans, Accruing Loans 90 Days or More Past Due [Member] | Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 1 0
Two years before current fiscal year 1 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 1 2
Total loans $ 3 $ 2
[1] Includes loans funded under the Paycheck Protection Program ("PPP") which totaled $1,294 million and $1,043 million at March 31, 2021 and December 31, 2020, respectively. 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 $30 million and $32 million at March 31, 2021 and December 31, 2020, respectively. See Note 10, "Fair Value Option," for further details.