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SEGMENT INFORMATION - Significant Segment Expenses and Measure of Segment Profit or Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Net interest income (expense) | $ 6,814 | $ 7,143 | $ 6,712
Rental income on operating lease equipment | 1,096 | 1,048 | 971
All other noninterest income | 1,631 | 1,567 | 11,104
Total noninterest income | 2,727 | 2,615 | 12,075
Total revenue | 9,541 | 9,758 | 18,787
Depreciation on operating lease equipment | 398 | 394 | 371
Maintenance and other operating lease expenses | 244 | 219 | 222
Personnel cost | 3,294 | 3,078 | 2,636
Acquisition-related expenses | 141 | 210 | 470
All other noninterest expense | 1,979 | 1,834 | 1,636
Total noninterest expense | 6,056 | 5,735 | 5,335
Provision for credit losses | 514 | 431 | 1,375
Income (loss) before income taxes | 2,971 | 3,592 | 12,077
Income tax expense | 765 | 815 | 611
Net income | 2,206 | 2,777 | 11,466
Loans and leases | 147,930 | 140,221 | 133,302
Operating lease equipment, net | 9,621 | 9,323 | 8,746
Investment securities | 41,564 | 44,090 | 29,999
Deposits | 161,578 | 155,229 | 145,854
Operating Segments | General Bank |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Net interest income (expense) | 3,299 | 2,951 | 2,560
Rental income on operating lease equipment | 0 | 0 | 0
All other noninterest income | 664 | 612 | 526
Total noninterest income | 664 | 612 | 526
Total revenue | 3,963 | 3,563 | 3,086
Depreciation on operating lease equipment | 0 | 0 | 0
Maintenance and other operating lease expenses | 0 | 0 | 0
Personnel cost | 838 | 783 | 734
Acquisition-related expenses | 0 | 0 | 0
All other noninterest expense | 1,493 | 1,342 | 1,259
Total noninterest expense | 2,331 | 2,125 | 1,993
Provision for credit losses | 77 | 135 | 53
Income (loss) before income taxes | 1,555 | 1,303 | 1,040
Income tax expense | 380 | 362 | 279
Net income | 1,175 | 941 | 761
Loans and leases | 64,958 | 64,887 | 61,245
Operating lease equipment, net | 0 | 0 | 0
Investment securities | 0 | 0 | 0
Deposits | 74,796 | 72,956 | 68,507
Operating Segments | Commercial Bank |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Net interest income (expense) | 3,205 | 3,403 | 2,682
Rental income on operating lease equipment | 219 | 227 | 231
All other noninterest income | 906 | 882 | 756
Total noninterest income | 1,125 | 1,109 | 987
Total revenue | 4,330 | 4,512 | 3,669
Depreciation on operating lease equipment | 175 | 185 | 179
Maintenance and other operating lease expenses | 0 | 0 | 0
Personnel cost | 737 | 741 | 599
Acquisition-related expenses | 0 | 0 | 0
All other noninterest expense | 1,686 | 1,626 | 1,468
Total noninterest expense | 2,598 | 2,552 | 2,246
Provision for credit losses | 437 | 296 | 606
Income (loss) before income taxes | 1,295 | 1,664 | 817
Income tax expense | 320 | 442 | 213
Net income | 975 | 1,222 | 604
Loans and leases | 82,910 | 75,272 | 72,034
Operating lease equipment, net | 739 | 750 | 780
Investment securities | 0 | 0 | 0
Deposits | 41,532 | 40,026 | 38,179
Operating Segments | Rail |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Net interest income (expense) | (213) | (186) | (141)
Rental income on operating lease equipment | 877 | 821 | 740
All other noninterest income | 16 | 14 | 5
Total noninterest income | 893 | 835 | 745
Total revenue | 680 | 649 | 604
Depreciation on operating lease equipment | 223 | 209 | 192
Maintenance and other operating lease expenses | 244 | 219 | 222
Personnel cost | 26 | 25 | 22
Acquisition-related expenses | 0 | 0 | 0
All other noninterest expense | 72 | 59 | 50
Total noninterest expense | 565 | 512 | 486
Provision for credit losses | 0 | 0 | 0
Income (loss) before income taxes | 115 | 137 | 118
Income tax expense | 28 | 36 | 31
Net income | 87 | 101 | 87
Loans and leases | 62 | 62 | 23
Operating lease equipment, net | 8,882 | 8,573 | 7,966
Investment securities | 0 | 0 | 0
Deposits | 2 | 18 | 13
Corporate |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Net interest income (expense) | 523 | 975 | 1,611
Rental income on operating lease equipment | 0 | 0 | 0
All other noninterest income | 45 | 59 | 9,817
Total noninterest income | 45 | 59 | 9,817
Total revenue | 568 | 1,034 | 11,428
Depreciation on operating lease equipment | 0 | 0 | 0
Maintenance and other operating lease expenses | 0 | 0 | 0
Personnel cost | 1,693 | 1,529 | 1,281
Acquisition-related expenses | 141 | 210 | 470
All other noninterest expense | (1,272) | (1,193) | (1,141)
Total noninterest expense | 562 | 546 | 610
Provision for credit losses | 0 | 0 | 716
Income (loss) before income taxes | 6 | 488 | 10,102
Income tax expense | 37 | (25) | 88
Net income | (31) | 513 | 10,014
Loans and leases | 0 | 0 | 0
Operating lease equipment, net | 0 | 0 | 0
Investment securities | 41,564 | 44,090 | 29,999
Deposits | $ 45,248 | $ 42,229 | $ 39,155

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