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Investment Securities - Schedule Of FHN's Investment Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 9,496 |
Securities available for sale at fair value | 8,391 | $ 8,836
Amortized Cost | 1,323 | 1,371
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (162) | (162)
Fair Value | 1,161 | 1,209
Government agency issued MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,061 | 5,457
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | (579) | (695)
Securities available for sale at fair value | 4,484 | 4,763
Amortized Cost | 471 | 897
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (66) | (109)
Fair Value | 405 | 788
Government agency issued CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,487 | 2,682
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (341) | (369)
Securities available for sale at fair value | 2,146 | 2,313
Amortized Cost | 852 | 474
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (96) | (53)
Fair Value | 756 | 421
Other U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,321 | 1,325
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (151) | (162)
Securities available for sale at fair value | 1,172 | 1,163
States and municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 627 | 658
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | (41) | (62)
Securities available for sale at fair value | 589 | 597
Securities available-for-sale, excluding interest only strip |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,496 | 10,122
Gross Unrealized Gains | 7 | 2
Gross Unrealized Losses | (1,112) | (1,288)
Securities available for sale at fair value | 8,391 | 8,836
Securities available-for-sale, excluding interest only strip | Asset Pledged as Collateral |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 8,900 | $ 6,500

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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