v3.26.1
Business Segments - Summary on Reconciliation of Results Under IFRS to US GAAP (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Operating Statistics [Line Items]          
Net interest income (expense), U.S. GAAP Consolidated $ 549 $ 523 $ 1,101 $ 1,049  
Other operating income, U.S. GAAP Consolidated 612 518 1,156 1,034  
Total operating income, U.S. GAAP Consolidated 1,161 1,041 2,257 2,083  
Expected credit losses / provision for credit losses, U.S. GAAP Consolidated (38) 42 10 160  
Total income 1,199 999 2,247 1,923  
Total operating expenses, U.S. GAAP Consolidated 703 696 1,372 1,356  
Income before income tax 496 303 875 567  
Total assets, U.S. GAAP Consolidated 180,708 176,367 180,708 176,367 $ 172,410
Total loans, net, U.S. GAAP Consolidated 61,680 63,585 61,680 63,585 59,452
Goodwill, U.S. GAAP Consolidated 458 458 458 458 458
Total deposits, U.S. GAAP Consolidated 126,813 126,181 126,813 126,181 $ 124,097
Group Reporting Basis Adjustments          
Operating Statistics [Line Items]          
Net interest income (expense) 6 6 11 12  
Other operating income (2) 0 (9) (3)  
Total operating income (expense) 4 6 2 9  
Expected credit losses / provision for credit losses (30) (22) (18) 10  
Total income 34 28 20 (1)  
Total operating expenses 10 (1) 15 9  
Profit (loss) before income tax 24 29 5 (10)  
Total assets (15,917) (17,616) (15,917) (17,616)  
Total loans, net 59 (1,684) 59 (1,684)  
Goodwill 100 100 100 100  
Total deposits (2,693) (1,598) (2,693) (1,598)  
Group Reporting Basis Reclassifications          
Operating Statistics [Line Items]          
Net interest income (expense) 14 (46) 20 (85)  
Other operating income (1) 56 6 105  
Total operating income (expense) 13 10 26 20  
Expected credit losses / provision for credit losses 0 0 0 0  
Total income 13 10 26 20  
Total operating expenses 13 10 26 20  
Profit (loss) before income tax 0 0 0 0  
Total assets 0 0 0 0  
Total loans, net 988 3,334 988 3,334  
Goodwill 0 0 0 0  
Total deposits 7,048 9,012 7,048 9,012  
Operating Segments          
Operating Statistics [Line Items]          
Net interest income (expense) 529 563 1,070 1,122  
Other operating income 615 462 1,159 932  
Total operating income (expense) 1,144 1,025 2,229 2,054  
Expected credit losses / provision for credit losses (8) 64 28 150  
Total income 1,152 961 2,201 1,904  
Direct Costs 204 234 402 472  
Indirect Costs 476 453 929 855  
Total operating expenses 680 687 1,331 1,327  
Profit (loss) before income tax 472 274 870 577  
Total assets 196,625 193,983 196,625 193,983  
Total loans, net 60,633 61,935 60,633 61,935  
Goodwill 358 358 358 358  
Total deposits 122,458 118,767 122,458 118,767  
IWPB | Operating Segments          
Operating Statistics [Line Items]          
Net interest income (expense) 172 188 362 374  
Other operating income 62 64 128 115  
Total operating income (expense) 234 252 490 489  
Expected credit losses / provision for credit losses 1 1 3 3  
Total income 233 251 487 486  
Direct Costs 90 106 174 192  
Indirect Costs 92 97 194 196  
Total operating expenses 182 203 368 388  
Profit (loss) before income tax 51 48 119 98  
Total assets 33,991 38,525 33,991 38,525  
Total loans, net 24,918 27,369 24,918 27,369  
Goodwill 0 0 0 0  
Total deposits 25,424 27,247 25,424 27,247  
CIB | Operating Segments          
Operating Statistics [Line Items]          
Net interest income (expense) 481 460 966 933  
Other operating income 433 313 780 636  
Total operating income (expense) 914 773 1,746 1,569  
Expected credit losses / provision for credit losses (9) 63 25 147  
Total income 923 710 1,721 1,422  
Direct Costs 86 115 174 225  
Indirect Costs 336 327 670 640  
Total operating expenses 422 442 844 865  
Profit (loss) before income tax 501 268 877 557  
Total assets 159,053 151,215 159,053 151,215  
Total loans, net 35,715 34,566 35,715 34,566  
Goodwill 358 358 358 358  
Total deposits 97,034 91,520 97,034 91,520  
CC | Operating Segments          
Operating Statistics [Line Items]          
Net interest income (expense) (124) (85) (258) (185)  
Other operating income 120 85 251 181  
Total operating income (expense) (4) 0 (7) (4)  
Expected credit losses / provision for credit losses 0 0 0 0  
Total income (4) 0 (7) (4)  
Direct Costs 28 13 54 55  
Indirect Costs 48 29 65 19  
Total operating expenses 76 42 119 74  
Profit (loss) before income tax (80) (42) (126) (78)  
Total assets 3,581 4,243 3,581 4,243  
Total loans, net 0 0 0 0  
Goodwill 0 0 0 0  
Total deposits $ 0 $ 0 $ 0 $ 0