v3.26.3
Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Statement Related Disclosures        
Net interest income $ 986 $ 397 $ 2,875 $ 1,143
Provision for (reversal of) credit losses 86 32 224 73
Net interest income after provision for credit losses 900 365 2,651 1,070
Non-interest revenue:        
Core banking fees 96 34 280 98
Wealth management revenue 88 38 257 103
Capital markets income 17 4 53 11
Total loan sales and servicing 8 5 27 17
Other non-interest revenue 117 66 240 140
Total non-interest revenue 326 147 857 369
Non-interest expense:        
Salaries and other personnel expense 398 185 1,172 537
Net occupancy, equipment and software expense 101 45 300 131
Other operating expense 250 73 951 196
Total non-interest expense 749 303 2,423 864
Income before income taxes 477 209 1,085 575
Merger-related expense 56 8 382 8
Operating Segments | Banking        
Income Statement Related Disclosures        
Net interest income 836 359 2,398 1,062
Provision for (reversal of) credit losses 84 31 220 71
Net interest income after provision for credit losses 752 328 2,178 991
Non-interest revenue:        
Core banking fees 84 27 247 78
Wealth management revenue 4 6 12 15
Capital markets income 17 4 53 11
Total loan sales and servicing 8 5 27 17
Other non-interest revenue 32 1 42 7
Total non-interest revenue 145 43 381 128
Non-interest expense:        
Salaries and other personnel expense 220 119 646 344
Net occupancy, equipment and software expense 39 19 120 56
Other operating expense 66 25 185 69
Total non-interest expense 325 163 951 469
Income before income taxes 572 208 1,608 650
Operating Segments | Wealth        
Income Statement Related Disclosures        
Net interest income 10 2 30 8
Provision for (reversal of) credit losses 0 0 0 0
Net interest income after provision for credit losses 10 2 30 8
Non-interest revenue:        
Core banking fees 0 0 0 0
Wealth management revenue 84 32 245 88
Capital markets income 0 0 0 0
Total loan sales and servicing 0 0 0 0
Other non-interest revenue 0 0 1 0
Total non-interest revenue 84 32 246 88
Non-interest expense:        
Salaries and other personnel expense 50 21 149 59
Net occupancy, equipment and software expense 1 0 4 0
Other operating expense 8 1 26 4
Total non-interest expense 59 22 179 63
Income before income taxes 35 12 97 33
Treasury and Corporate Other        
Income Statement Related Disclosures        
Net interest income 140 36 447 73
Provision for (reversal of) credit losses 2 1 4 2
Net interest income after provision for credit losses 138 35 443 71
Non-interest revenue:        
Core banking fees 12 7 33 20
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 85 65 197 133
Total non-interest revenue 97 72 230 153
Non-interest expense:        
Salaries and other personnel expense 128 45 377 134
Net occupancy, equipment and software expense 61 26 176 75
Other operating expense 176 47 740 123
Total non-interest expense 365 118 1,293 332
Income before income taxes (130) (11) (620) (108)
Merger-related expense 52 $ 8 371 $ 8
Treasury and Corporate Other | Synovus Financial Corp        
Non-interest expense:        
Merger-related expense $ 56   $ 382