v3.26.3
SEGMENT INFORMATION - Significant Segment Expenses and Measure of Segment Profit or Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Net interest income (expense) $ 1,699 $ 1,734 $ 4,976 $ 5,092  
Rental income on operating lease equipment 288 273 849 815  
All other noninterest income 446 426 1,353 1,197  
Total noninterest income 734 699 2,202 2,012  
Total revenue 2,433 2,433 7,178 7,104  
Depreciation on operating lease equipment 100 98 302 296  
Maintenance and other operating lease expenses 66 67 198 180  
Personnel cost 842 817 2,555 2,445  
Acquisition-related expenses 18 28 31 108  
All other noninterest expense 547 481 1,574 1,455  
Total noninterest expense 1,573 1,491 4,660 4,484  
Provision for credit losses 55 191 117 460  
Income (loss) before income taxes 805 751 2,401 2,160  
Income tax expense 199 183 589 534  
Net income (loss) 606 568 1,812 1,626  
Loans and leases 157,190 144,758 157,190 144,758 $ 147,930
Operating lease equipment, net 9,765 9,446 9,765 9,446 9,621
Investment securities 44,875 45,124 44,875 45,124  
Deposits 185,264 163,190 185,264 163,190 $ 161,578
Operating Segments | General Bank          
Segment Reporting [Line Items]          
Net interest income (expense) 829 846 2,461 2,458  
Rental income on operating lease equipment 0 0 0 0  
All other noninterest income 184 166 543 494  
Total noninterest income 184 166 543 494  
Total revenue 1,013 1,012 3,004 2,952  
Depreciation on operating lease equipment 0 0 0 0  
Maintenance and other operating lease expenses 0 0 0 0  
Personnel cost 225 210 649 627  
Acquisition-related expenses 0 0 0 0  
All other noninterest expense 397 372 1,174 1,100  
Total noninterest expense 622 582 1,823 1,727  
Provision for credit losses 37 1 108 60  
Income (loss) before income taxes 354 429 1,073 1,165  
Income tax expense 88 109 263 298  
Net income (loss) 266 320 810 867  
Loans and leases 64,988 65,225 64,988 65,225  
Operating lease equipment, net 0 0 0 0  
Investment securities 18 0 18 0  
Deposits 81,381 74,596 81,381 74,596  
Operating Segments | Commercial Bank          
Segment Reporting [Line Items]          
Net interest income (expense) 848 796 2,455 2,371  
Rental income on operating lease equipment 51 54 160 164  
All other noninterest income 269 236 769 665  
Total noninterest income 320 290 929 829  
Total revenue 1,168 1,086 3,384 3,200  
Depreciation on operating lease equipment 41 43 127 131  
Maintenance and other operating lease expenses 0 0 0 0  
Personnel cost 186 184 571 557  
Acquisition-related expenses 0 0 0 0  
All other noninterest expense 398 412 1,202 1,254  
Total noninterest expense 625 639 1,900 1,942  
Provision for credit losses 18 190 9 400  
Income (loss) before income taxes 525 257 1,475 858  
Income tax expense 131 64 362 218  
Net income (loss) 394 193 1,113 640  
Loans and leases 92,119 79,470 92,119 79,470  
Operating lease equipment, net 717 737 717 737  
Investment securities 0 0 0 0  
Deposits 47,151 42,869 47,151 42,869  
Operating Segments | Rail          
Segment Reporting [Line Items]          
Net interest income (expense) (60) (55) (177) (160)  
Rental income on operating lease equipment 237 219 689 651  
All other noninterest income 2 2 18 7  
Total noninterest income 239 221 707 658  
Total revenue 179 166 530 498  
Depreciation on operating lease equipment 59 55 175 165  
Maintenance and other operating lease expenses 66 67 198 180  
Personnel cost 7 6 21 20  
Acquisition-related expenses 0 0 0 0  
All other noninterest expense 19 16 54 56  
Total noninterest expense 151 144 448 421  
Provision for credit losses 0 0 0 0  
Income (loss) before income taxes 28 22 82 77  
Income tax expense 7 5 20 19  
Net income (loss) 21 17 62 58  
Loans and leases 83 63 83 63  
Operating lease equipment, net 9,048 8,709 9,048 8,709  
Investment securities 0 0 0 0  
Deposits 2 2 2 2  
Corporate          
Segment Reporting [Line Items]          
Net interest income (expense) 82 147 237 423  
Rental income on operating lease equipment 0 0 0 0  
All other noninterest income (9) 22 23 31  
Total noninterest income (9) 22 23 31  
Total revenue 73 169 260 454  
Depreciation on operating lease equipment 0 0 0 0  
Maintenance and other operating lease expenses 0 0 0 0  
Personnel cost 424 417 1,314 1,241  
Acquisition-related expenses 18 28 31 108  
All other noninterest expense (267) (319) (856) (955)  
Total noninterest expense 175 126 489 394  
Provision for credit losses 0 0 0 0  
Income (loss) before income taxes (102) 43 (229) 60  
Income tax expense (27) 5 (56) (1)  
Net income (loss) (75) 38 (173) 61  
Loans and leases 0 0 0 0  
Operating lease equipment, net 0 0 0 0  
Investment securities 44,857 45,124 44,857 45,124  
Deposits $ 56,730 $ 45,723 $ 56,730 $ 45,723