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Premises, Equipment, and Leases - Schedule of Maturity of Lease Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Property, Plant and Equipment [Abstract] |  |
2024 | $ 44 |
2025 | 43 |
2026 | 42 |
2027 | 41 |
2028 | 35 |
2029 and thereafter | 204 |
Total lease payments | 409 |
Less lease liability interest | (64) |
Total lease liability | $ 345 | $ 371

X
- Definition Lease, Liability + References No definition available. + Details
Name: | fhn_LeaseLiability
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDue
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due After Year Five + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueAfterYearFive
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Five + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearFive
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Four + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearFour
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease Liability, Payments, Due Year One + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearOne
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Three + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearThree
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Liability, Payments, Due Year Two + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityPaymentsDueYearTwo
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Lease, Undiscounted Excess Amount + References No definition available. + Details
Name: | fhn_LesseeLeaseLiabilityUndiscountedExcessAmount
Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration