| As of and for the years ended December 31 ($ in millions, except for per share data) | | 2019 | | | | 2018 | | | | 2017 | | | | 2016 | | | | 2015 | | | |
| Income Statement Data | | | | | | | | | | | | | | | | | | | | | |
| Net interest income (U.S. GAAP) | | $ | 4,797 | | | | 4,140 | | | | 3,798 | | | | 3,615 | | | | 3,533 | | |
| Net interest income (FTE) (a)(b) | | | 4,814 | | | | 4,156 | | | | 3,824 | | | | 3,640 | | | | 3,554 | | |
| Noninterest income | | | 3,536 | | | | 2,790 | | | | 3,224 | | | | 2,696 | | | | 3,003 | | |
| Total revenue (a) | | | 8,350 | | | | 6,946 | | | | 7,048 | | | | 6,336 | | | | 6,557 | | |
| Provision for credit losses (c) | | | 471 | | | | 207 | | | | 261 | | | | 366 | | | | 400 | | |
| Noninterest expense | | | 4,660 | | | | 3,958 | | | | 3,782 | | | | 3,737 | | | | 3,643 | | |
| Net income attributable to Bancorp | | | 2,512 | | | | 2,193 | | | | 2,180 | | | | 1,547 | | | | 1,685 | | |
| Net income available to common shareholders | | | 2,419 | | | | 2,118 | | | | 2,105 | | | | 1,472 | | | | 1,610 | | |
| Common Share Data | | | | | | | | | | | | | | | | | | | | | |
| Earnings per share - basic | | $ | 3.38 | | | | 3.11 | | | | 2.86 | | | | 1.92 | | | | 2.00 | | |
| Earnings per share - diluted | | | 3.33 | | | | 3.06 | | | | 2.81 | | | | 1.91 | | | | 1.97 | | |
| Cash dividends declared per common share | | | 0.94 | | | | 0.74 | | | | 0.60 | | | | 0.53 | | | | 0.52 | | |
| Book value per share | | | 27.41 | | | | 23.07 | | | | 21.43 | | | | 19.62 | | | | 18.31 | | |
| Market value per share | | | 30.74 | | | | 23.53 | | | | 30.34 | | | | 26.97 | | | | 20.10 | | |
| Financial Ratios | | | | | | | | | | | | | | | | | | | | | |
| Return on average assets | | | 1.53 | % | | | 1.54 | | | | 1.55 | | | | 1.09 | | | | 1.20 | | |
| Return on average common equity | | | 13.1 | | | | 14.5 | | | | 13.9 | | | | 9.7 | | | | 11.2 | | |
| Return on average tangible common equity (including AOCI) (b) | | | 17.1 | | | | 17.5 | | | | 16.6 | | | | 11.6 | | | | 13.5 | | |
| Return on average tangible common equity (excluding AOCI) (b) | | | 18.2 | | | | 16.7 | | | | 16.9 | | | | 12.2 | | | | 13.9 | | |
| Dividend payout | | | 27.8 | | | | 23.8 | | | | 21.0 | | | | 27.6 | | | | 26.0 | | |
| Average total Bancorp shareholders’ equity as a percent of average assets | | | 12.14 | | | | 11.23 | | | | 11.69 | | | | 11.57 | | | | 11.24 | | |
| Tangible common equity as a percent of tangible assets (excluding AOCI) (b) | | | 8.44 | | | | 8.71 | | | | 8.83 | | | | 8.77 | | | | 8.50 | | |
| Net interest margin (a)(b) | | | 3.31 | | | | 3.22 | | | | 3.03 | | | | 2.88 | | | | 2.88 | | |
| Net interest rate spread (a)(b) | | | 2.92 | | | | 2.87 | | | | 2.76 | | | | 2.66 | | | | 2.69 | | |
| Efficiency (a)(b) | | | 55.8 | | | | 57.0 | | | | 53.7 | | | | 59.0 | | | | 55.6 | | |
| Credit Quality | | | | | | | | | | | | | | | | | | | | | |
| Net losses charged-off | | $ | 369 | | | | 330 | | | | 298 | | | | 362 | | | | 446 | | |
| Net losses charged-off as a percent of average portfolio loans and leases | | | 0.35 | % | | | 0.35 | | | | 0.32 | | | | 0.39 | | | | 0.48 | | |
| ALLL as a percent of portfolio loans and leases | | | 1.10 | | | | 1.16 | | | | 1.30 | | | | 1.36 | | | | 1.37 | | |
| Allowance for credit losses as a percent of portfolio loans and leases (d) | | | 1.23 | | | | 1.30 | | | | 1.48 | | | | 1.54 | | | | 1.52 | | |
| Nonperforming portfolio assets as a percent of portfolio loans and leases and OREO | | | 0.62 | | | | 0.41 | | | | 0.53 | | | | 0.80 | | | | 0.70 | | |
| Average Balances | | | | | | | | | | | | | | | | | | | | | |
| Loans and leases, including held for sale | | $ | 107,794 | | | | 93,876 | | | | 92,731 | | | | 94,320 | | | | 93,339 | | |
| Securities and other short-term investments | | | 37,610 | | | | 35,029 | | | | 33,562 | | | | 31,965 | | | | 30,245 | | |
| Assets | | | 163,936 | | | | 142,183 | | | | 140,527 | | | | 142,173 | | | | 139,999 | | |
| Transaction deposits (e) | | | 111,130 | | | | 97,914 | | | | 96,052 | | | | 95,371 | | | | 95,244 | | |
| Core deposits (f) | | | 116,600 | | | | 102,020 | | | | 99,823 | | | | 99,381 | | | | 99,295 | | |
| Wholesale funding (g) | | | 22,451 | | | | 20,573 | | | | 20,360 | | | | 21,813 | | | | 20,210 | | |
| Bancorp shareholders’ equity | | | 19,902 | | | | 15,970 | | | | 16,424 | | | | 16,453 | | | | 15,742 | | |
| Regulatory Capital Ratios | | | | | | | | | | | | | | | | | | | | | |
| CET1 capital (h) | | | 9.75 | % | | | 10.24 | | | | 10.61 | | | | 10.39 | | | | 9.82 | | |
| Tier I risk-based capital (h) | | | 10.99 | | | | 11.32 | | | | 11.74 | | | | 11.50 | | | | 10.93 | | |
| Total risk-based capital (h) | | | 13.84 | | | | 14.48 | | | | 15.16 | | | | 15.02 | | | | 14.13 | | |
| Tier I leverage | | | 9.54 | | | | 9.72 | | | | 10.01 | | | | 9.90 | | | | 9.54 | | |