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Variable Interest Entities - Summary of VIE Not Consolidated By FHN (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Liability Recognized | $ 70,406 | $ 80,598
Trading securities: | 1,375 | 1,601
Securities held to maturity | 1,371 | 712
Term borrowings | 1,597 | 1,590
Fair Value | 1,209 | 705
Low income housing partnerships |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 463 | 382
Maximum loss exposure, contractual funding commitments | 154 | 129
Low income housing partnerships | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 154 | 129
Low income housing partnerships | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Maximum loss exposure, current investments | 309 | 253
Other tax credit investments |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 85 | 77
Other tax credit investments | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 67 | 56
Small issuer trust preferred holdings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 171 | 195
Small issuer trust preferred holdings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 0 | 0
On-balance sheet trust preferred securitization |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 27 | 27
Loans, net of unearned income | 112 | 112
Trading securities: | 2 | 2
Term borrowings | 87 | 87
On-balance sheet trust preferred securitization | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 87 | 87
Holdings of agency mortgage-backed securities |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 8,652 | 8,550
Trading securities: | 205 | 526
Securities held to maturity | 1,400 |
Fair Value |  | 712
Securities available for sale at fair value | 7,100 | 7,300
Holdings of agency mortgage-backed securities | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 0 | 0
Commercial loan troubled debt restructurings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 53 | 98
Maximum loss exposure, contractual funding commitments |  | 4
Commercial loan troubled debt restructurings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 0 | 0
Commercial loan troubled debt restructurings | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Maximum loss exposure, current investments | 53 | 94
Proprietary trust preferred issuances |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 0 | 0
Proprietary trust preferred issuances | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | $ 167 | $ 167

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