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Loans and asset quality - Credit Risk Profile by Grade (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year $ 12,569 $ 9,744
Originated, at amortized cost, fiscal year before current fiscal year 1,980 2,325
Originated, at amortized cost, two years before current fiscal year 1,946 3,710
Originated, at amortized cost, three years before current fiscal year 3,475 2,957
Originated, at amortized cost, four years before current fiscal year 2,649 1,603
Originated, at amortized cost, more than five years before current fiscal year 6,742 6,398
Amortized cost 42,989 41,196
Converted to term loans – Amortized cost 193 118
Total 72,543 68,051
Accrued interest receivable 297 336
Loans 75,195 71,570
Total wealth management loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 11 3
Originated, at amortized cost, fiscal year before current fiscal year 0 29
Originated, at amortized cost, two years before current fiscal year 29 33
Originated, at amortized cost, three years before current fiscal year 26 110
Originated, at amortized cost, four years before current fiscal year 51 33
Originated, at amortized cost, more than five years before current fiscal year 91 109
Amortized cost 8,797 8,281
Converted to term loans – Amortized cost 175 100
Total 9,180 8,698
Accrued interest receivable 57 50
Total wealth management loans | Wealth management mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 462 495
Originated, at amortized cost, fiscal year before current fiscal year 276 798
Originated, at amortized cost, two years before current fiscal year 766 1,585
Originated, at amortized cost, three years before current fiscal year 1,514 1,812
Originated, at amortized cost, four years before current fiscal year 1,747 818
Originated, at amortized cost, more than five years before current fiscal year 3,927 3,423
Amortized cost 15 19
Converted to term loans – Amortized cost 0 0
Total 8,707 8,950
Accrued interest receivable 24 23
Writeoff 1  
Other residential mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 389 15
Originated, at amortized cost, fiscal year before current fiscal year 357 148
Originated, at amortized cost, two years before current fiscal year 173 529
Originated, at amortized cost, three years before current fiscal year 501 184
Originated, at amortized cost, four years before current fiscal year 175 5
Originated, at amortized cost, more than five years before current fiscal year 172 187
Amortized cost 0 0
Converted to term loans – Amortized cost 0 0
Total 1,767 1,068
Accrued interest receivable 6 4
Loans 1,767 1,068
Writeoff 1 1
Capital call financing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 230 91
Originated, at amortized cost, fiscal year before current fiscal year 130 0
Originated, at amortized cost, two years before current fiscal year 0 0
Originated, at amortized cost, three years before current fiscal year 0 0
Originated, at amortized cost, four years before current fiscal year 0 0
Originated, at amortized cost, more than five years before current fiscal year 0 0
Amortized cost 4,630 5,072
Converted to term loans – Amortized cost 0 0
Total 4,990 5,163
Accrued interest receivable 24 28
Loans 4,990 5,163
Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 0 0
Originated, at amortized cost, fiscal year before current fiscal year 0 0
Originated, at amortized cost, two years before current fiscal year 0 0
Originated, at amortized cost, three years before current fiscal year 0 0
Originated, at amortized cost, four years before current fiscal year 0 0
Originated, at amortized cost, more than five years before current fiscal year 0 0
Amortized cost 3,584 3,063
Converted to term loans – Amortized cost 0 0
Total 3,584 3,063
Accrued interest receivable 6 6
Loans 3,584 3,063
Margin loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 10,452 7,732
Originated, at amortized cost, fiscal year before current fiscal year 0 0
Originated, at amortized cost, two years before current fiscal year 0 0
Originated, at amortized cost, three years before current fiscal year 0 0
Originated, at amortized cost, four years before current fiscal year 0 0
Originated, at amortized cost, more than five years before current fiscal year 0 0
Amortized cost 12,632 11,405
Converted to term loans – Amortized cost 0 0
Total 23,084 19,137
Accrued interest receivable 35 38
Loans 23,084 19,137
Overdrafts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 2,652 $ 3,519
Overdraft repayment period 2 days 2 days
Overdrafts | Overdrafts    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 2,652 $ 3,519
Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Writeoff   82
Wealth management mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Writeoff   1
Investment grade | Total wealth management loans | Loans receivable    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 11 3
Originated, at amortized cost, fiscal year before current fiscal year 0 29
Originated, at amortized cost, two years before current fiscal year 29 33
Originated, at amortized cost, three years before current fiscal year 26 110
Originated, at amortized cost, four years before current fiscal year 51 33
Originated, at amortized cost, more than five years before current fiscal year 91 109
Amortized cost 8,773 8,261
Converted to term loans – Amortized cost 175 100
Total 9,156 8,678
Non-investment grade | Total wealth management loans | Loans receivable    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 0 0
Originated, at amortized cost, fiscal year before current fiscal year 0 0
Originated, at amortized cost, two years before current fiscal year 0 0
Originated, at amortized cost, three years before current fiscal year 0 0
Originated, at amortized cost, four years before current fiscal year 0 0
Originated, at amortized cost, more than five years before current fiscal year 0 0
Amortized cost 24 20
Converted to term loans – Amortized cost 0 0
Total 24 20
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 25 55
Originated, at amortized cost, fiscal year before current fiscal year 35 98
Originated, at amortized cost, two years before current fiscal year 68 20
Originated, at amortized cost, three years before current fiscal year 16 72
Originated, at amortized cost, four years before current fiscal year 51 0
Originated, at amortized cost, more than five years before current fiscal year 115 116
Amortized cost 1,023 1,059
Converted to term loans – Amortized cost 0 0
Total 1,333 1,420
Accrued interest receivable 1 2
Commercial | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 11 41
Originated, at amortized cost, fiscal year before current fiscal year 24 69
Originated, at amortized cost, two years before current fiscal year 54 20
Originated, at amortized cost, three years before current fiscal year 16 55
Originated, at amortized cost, four years before current fiscal year 51 0
Originated, at amortized cost, more than five years before current fiscal year 115 116
Amortized cost 998 1,010
Converted to term loans – Amortized cost 0 0
Total 1,269 1,311
Commercial | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 14 14
Originated, at amortized cost, fiscal year before current fiscal year 11 29
Originated, at amortized cost, two years before current fiscal year 14 0
Originated, at amortized cost, three years before current fiscal year 0 17
Originated, at amortized cost, four years before current fiscal year 0 0
Originated, at amortized cost, more than five years before current fiscal year 0 0
Amortized cost 25 49
Converted to term loans – Amortized cost 0 0
Total 64 109
Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 652 731
Originated, at amortized cost, fiscal year before current fiscal year 759 882
Originated, at amortized cost, two years before current fiscal year 835 1,513
Originated, at amortized cost, three years before current fiscal year 1,408 743
Originated, at amortized cost, four years before current fiscal year 593 674
Originated, at amortized cost, more than five years before current fiscal year 2,309 2,001
Amortized cost 193 220
Converted to term loans – Amortized cost 18 18
Total 6,767 6,782
Accrued interest receivable 25 28
Writeoff 25  
Commercial real estate | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 503 396
Originated, at amortized cost, fiscal year before current fiscal year 461 567
Originated, at amortized cost, two years before current fiscal year 616 762
Originated, at amortized cost, three years before current fiscal year 748 392
Originated, at amortized cost, four years before current fiscal year 301 460
Originated, at amortized cost, more than five years before current fiscal year 1,455 1,384
Amortized cost 146 126
Converted to term loans – Amortized cost 0 0
Total 4,230 4,087
Commercial real estate | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 149 335
Originated, at amortized cost, fiscal year before current fiscal year 298 315
Originated, at amortized cost, two years before current fiscal year 219 751
Originated, at amortized cost, three years before current fiscal year 660 351
Originated, at amortized cost, four years before current fiscal year 292 214
Originated, at amortized cost, more than five years before current fiscal year 854 617
Amortized cost 47 94
Converted to term loans – Amortized cost 18 18
Total 2,537 2,695
Financial institutions    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 348 622
Originated, at amortized cost, fiscal year before current fiscal year 423 370
Originated, at amortized cost, two years before current fiscal year 75 30
Originated, at amortized cost, three years before current fiscal year 10 26
Originated, at amortized cost, four years before current fiscal year 25 42
Originated, at amortized cost, more than five years before current fiscal year 42 0
Amortized cost 12,115 12,077
Converted to term loans – Amortized cost 0 0
Total 13,038 13,167
Accrued interest receivable 119 157
Financial institutions | Investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 295 491
Originated, at amortized cost, fiscal year before current fiscal year 373 370
Originated, at amortized cost, two years before current fiscal year 75 20
Originated, at amortized cost, three years before current fiscal year 10 26
Originated, at amortized cost, four years before current fiscal year 25 42
Originated, at amortized cost, more than five years before current fiscal year 42 0
Amortized cost 10,404 10,363
Converted to term loans – Amortized cost 0 0
Total 11,224 11,312
Financial institutions | Non-investment grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 53 131
Originated, at amortized cost, fiscal year before current fiscal year 50 0
Originated, at amortized cost, two years before current fiscal year 0 10
Originated, at amortized cost, three years before current fiscal year 0 0
Originated, at amortized cost, four years before current fiscal year 0 0
Originated, at amortized cost, more than five years before current fiscal year 0 0
Amortized cost 1,711 1,714
Converted to term loans – Amortized cost 0 0
Total 1,814 1,855
Lease financings    
Financing Receivable, Credit Quality Indicator [Line Items]    
Originated, at amortized cost, current fiscal year 0 0
Originated, at amortized cost, fiscal year before current fiscal year 0 0
Originated, at amortized cost, two years before current fiscal year 0 0
Originated, at amortized cost, three years before current fiscal year 0 10
Originated, at amortized cost, four years before current fiscal year 7 31
Originated, at amortized cost, more than five years before current fiscal year 86 562
Amortized cost 0 0
Converted to term loans – Amortized cost 0 0
Total 93 603
Accrued interest receivable $ 0 $ 0