v3.26.1
SEGMENT INFORMATION - Significant Segment Expenses and Measure of Segment Profit or Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting, Asset Reconciling Item [Line Items]      
Net interest income (expense) $ 1,621 $ 1,663  
Rental income on operating lease equipment 281 270  
All other noninterest income 411 365  
Total noninterest income 692 635  
Total revenue 2,313 2,298  
Depreciation on operating lease equipment 101 98  
Maintenance and other operating lease expenses 65 58  
Personnel cost 869 818  
Acquisition-related expenses 5 42  
All other noninterest expense 496 477  
Total noninterest expense 1,536 1,493  
Provision for credit losses 72 154  
Income (loss) before income taxes 705 651  
Income tax expense 171 168  
Net income 534 483  
Loans and leases 148,692 141,358 $ 147,930
Operating lease equipment, net 9,685 9,371 9,621
Investment securities 42,986 44,319  
Deposits 170,842 159,325 $ 161,578
Operating Segments | General Bank      
Segment Reporting, Asset Reconciling Item [Line Items]      
Net interest income (expense) 813 788  
Rental income on operating lease equipment 0 0  
All other noninterest income 172 164  
Total noninterest income 172 164  
Total revenue 985 952  
Depreciation on operating lease equipment 0 0  
Maintenance and other operating lease expenses 0 0  
Personnel cost 215 210  
Acquisition-related expenses 0 0  
All other noninterest expense 385 355  
Total noninterest expense 600 565  
Provision for credit losses 17 46  
Income (loss) before income taxes 368 341  
Income tax expense 90 88  
Net income 278 253  
Loans and leases 64,367 64,847  
Operating lease equipment, net 0 0  
Investment securities 0 0  
Deposits 75,914 74,309  
Operating Segments | Commercial Bank      
Segment Reporting, Asset Reconciling Item [Line Items]      
Net interest income (expense) 802 786  
Rental income on operating lease equipment 55 56  
All other noninterest income 230 201  
Total noninterest income 285 257  
Total revenue 1,087 1,043  
Depreciation on operating lease equipment 43 44  
Maintenance and other operating lease expenses 0 0  
Personnel cost 199 190  
Acquisition-related expenses 0 0  
All other noninterest expense 404 420  
Total noninterest expense 646 654  
Provision for credit losses 55 108  
Income (loss) before income taxes 386 281  
Income tax expense 95 72  
Net income 291 209  
Loans and leases 84,263 76,449  
Operating lease equipment, net 717 731  
Investment securities 0 0  
Deposits 47,191 40,014  
Operating Segments | Rail      
Segment Reporting, Asset Reconciling Item [Line Items]      
Net interest income (expense) (58) (52)  
Rental income on operating lease equipment 226 214  
All other noninterest income 9 2  
Total noninterest income 235 216  
Total revenue 177 164  
Depreciation on operating lease equipment 58 54  
Maintenance and other operating lease expenses 65 58  
Personnel cost 8 8  
Acquisition-related expenses 0 0  
All other noninterest expense 17 14  
Total noninterest expense 148 134  
Provision for credit losses 0 0  
Income (loss) before income taxes 29 30  
Income tax expense 7 8  
Net income 22 22  
Loans and leases 62 62  
Operating lease equipment, net 8,968 8,640  
Investment securities 0 0  
Deposits 2 12  
Corporate      
Segment Reporting, Asset Reconciling Item [Line Items]      
Net interest income (expense) 64 141  
Rental income on operating lease equipment 0 0  
All other noninterest income 0 (2)  
Total noninterest income 0 (2)  
Total revenue 64 139  
Depreciation on operating lease equipment 0 0  
Maintenance and other operating lease expenses 0 0  
Personnel cost 447 410  
Acquisition-related expenses 5 42  
All other noninterest expense (310) (312)  
Total noninterest expense 142 140  
Provision for credit losses 0 0  
Income (loss) before income taxes (78) (1)  
Income tax expense (21) 0  
Net income (57) (1)  
Loans and leases 0 0  
Operating lease equipment, net 0 0  
Investment securities 42,986 44,319  
Deposits $ 47,735 $ 44,990