v3.26.1
Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Income Statement Related Disclosures        
Net interest income $ 956 $ 380 $ 1,889 $ 746
Provision for (reversal of) credit losses 63 24 139 41
Net interest income after provision for credit losses 893 356 1,750 705
Non-interest revenue:        
Core banking fees 93 32 184 64
Wealth management revenue 85 32 169 65
Capital markets income 18 4 36 6
Total loan sales and servicing 9 6 19 12
Other non-interest revenue 42 51 123 74
Total non-interest revenue 247 125 531 221
Non-interest expense:        
Salaries and other personnel expense 378 180 774 351
Occupancy, equipment and software expense 102 44 199 86
Other operating expense 241 62 700 124
Total non-interest expense 721 286 1,673 561
Income before income taxes 419 195 608 365
Merger-related expense 51 0 326 0
Operating Segments | Banking        
Income Statement Related Disclosures        
Net interest income 807 355 1,562 705
Provision for (reversal of) credit losses 62 23 136 40
Net interest income after provision for credit losses 745 332 1,426 665
Non-interest revenue:        
Core banking fees 81 25 162 50
Wealth management revenue 5 4 8 9
Capital markets income 18 4 36 6
Total loan sales and servicing 9 6 19 12
Other non-interest revenue 9 2 12 3
Total non-interest revenue 122 41 237 80
Non-interest expense:        
Salaries and other personnel expense 205 113 413 224
Occupancy, equipment and software expense 40 19 80 37
Other operating expense 61 22 117 44
Total non-interest expense 306 154 610 305
Income before income taxes 561 219 1,053 440
Operating Segments | Wealth        
Income Statement Related Disclosures        
Net interest income 10 2 20 5
Provision for (reversal of) credit losses 0 0 0 0
Net interest income after provision for credit losses 10 2 20 5
Non-interest revenue:        
Core banking fees 0 0 0 0
Wealth management revenue 80 28 161 56
Capital markets income 0 0 0 0
Total loan sales and servicing 0 0 0 0
Other non-interest revenue 0 1 0 0
Total non-interest revenue 80 29 161 56
Non-interest expense:        
Salaries and other personnel expense 48 20 99 38
Occupancy, equipment and software expense 1 0 3 0
Other operating expense 9 1 18 3
Total non-interest expense 58 21 120 41
Income before income taxes 32 10 61 20
Treasury and Corporate Other        
Income Statement Related Disclosures        
Net interest income 139 23 307 36
Provision for (reversal of) credit losses 1 1 3 1
Net interest income after provision for credit losses 138 22 304 35
Non-interest revenue:        
Core banking fees 12 7 22 14
Wealth management revenue 0 0 0 0
Capital markets income 0 0 0 0
Total loan sales and servicing 0 0 0 0
Other non-interest revenue 33 48 111 71
Total non-interest revenue 45 55 133 85
Non-interest expense:        
Salaries and other personnel expense 125 47 262 89
Occupancy, equipment and software expense 61 25 116 49
Other operating expense 171 39 565 77
Total non-interest expense 357 111 943 215
Income before income taxes (174) $ (34) $ (506) (95)
Merger-related expense 48     319
Treasury and Corporate Other | Synovus Financial Corp        
Non-interest expense:        
Merger-related expense $ 51     $ 326