| Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and due from banks | 1,203 | 1,147 | 1,061 | 1,012 | 906 |
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| Interest-bearing deposits with banks | 8,351 | 14,907 | 1,384 | 1,328 | 1,538 |
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| Federal funds sold and securities purchased under agreements to resell | 445 | 641 | 482 | 719 | 631 |
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| Trading securities | 1,176 | 1,601 | 1,375 | 1,412 | 1,387 |
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| Securities available for sale at fair value | - | 8,707 | 8,836 | 8,391 | 7,896 |
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| Securities held to maturity (fair value of $1,083 and $1,161, respectively) | - | 712 | 1,371 | 1,323 | 1,270 |
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| Loans held for sale (including $85 and $68 at fair value, respectively) | 1,022 | 1,172 | 590 | 502 | 551 |
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| Loans and leases | - | 54,859 | 58,102 | 61,292 | 62,565 |
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| Allowance for loan and lease losses | - | 670 | 685 | 773 | 815 |
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| Net loans and leases | - | 54,189 | 57,417 | 60,519 | 61,750 |
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| Premises and equipment | 759 | 665 | 612 | 590 | 574 |
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| Goodwill | 1,511 | 1,511 | 1,511 | 1,510 | 1,510 |
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| Other intangible assets | 354 | 298 | 234 | 186 | 143 |
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| Other assets | 4,072 | 3,542 | 4,080 | 4,169 | 3,996 |
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| Total assets | 84,209 | 89,092 | 78,953 | 81,661 | 82,152 |
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| Noninterest-bearing deposits | 22,173 | 27,883 | 23,466 | 17,204 | 16,021 |
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| Interest-bearing deposits | 47,809 | 47,012 | 40,023 | 48,576 | 49,560 |
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| Total deposits | 69,982 | 74,895 | 63,489 | 65,780 | 65,581 |
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| Trading liabilities | 353 | 426 | 335 | 509 | 550 |
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| Short-Term Debt | 2,198 | 2,124 | 2,506 | 2,549 | 3,400 |
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| Term borrowings | 1,670 | 1,590 | 1,597 | 1,150 | 1,195 |
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| Other liabilities | 1,699 | 1,563 | 2,479 | 2,382 | 2,315 |
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| Total liabilities | 75,902 | 80,598 | 70,406 | 72,370 | 73,041 |
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| Preferred Stock, Value, Issued | 470 | 520 | 1,014 | 520 | 426 |
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| Common Stock, Value, Issued | 347 | 333 | 336 | 349 | 328 |
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| Capital surplus | 5,074 | 4,743 | 4,840 | 5,351 | 4,808 |
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| Retained earnings | 2,261 | 2,891 | 3,430 | 3,964 | 4,382 |
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| Accumulated other comprehensive loss, net | -140 | -288 | -1,368 | -1,188 | -1,128 |
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| FHN shareholders' equity | 8,307 | 8,494 | 8,547 | 9,291 | 9,111 |
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| Noncontrolling interest | 295 | 295 | 295 | 295 | 295 |
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| Total equity | 8,307 | 8,494 | 8,547 | 9,291 | 9,111 |
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| Total liabilities and equity | 84,209 | 89,092 | 78,953 | 81,661 | 82,152 |
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