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v3.22.2.2

Variable Interest Entities - Summary Of VIE Not Consolidated By FHN (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Liability Recognized | $ 72,016,000,000 | $ 80,598,000,000
Trading securities | 1,421,000,000 | 1,601,000,000
Term borrowings | 1,597,000,000 | 1,590,000,000
Securities held to maturity, at fair value | 1,222,000,000 | 705,000,000
Securities available-for-sale | 8,718,000,000 | 8,707,000,000
Low income housing partnerships |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 445,000,000 | 382,000,000
Maximum loss exposure, contractual funding commitments | 160,000,000 | 129,000,000
Low income housing partnerships | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 160,000,000 | 129,000,000
Low income housing partnerships | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Maximum loss exposure, current investments | 285,000,000 | 253,000,000
Other tax credit investments |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 87,000,000 | 77,000,000
Other tax credit investments | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 67,000,000 | 56,000,000
Small issuer trust preferred holdings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 172,000,000 | 195,000,000
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 | 27,000,000 | 27,000,000
Loans and leases | 112,000,000 | 112,000,000
Trading securities | 2,000,000 | 2,000,000
Term borrowings | 87,000,000 | 87,000,000
On-balance sheet trust preferred securitization | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 87,000,000 | 87,000,000
Holdings of agency mortgage-backed securities |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 8,785,000,000 | 8,550,000,000
Trading securities | 296,000,000 | 526,000,000
Securities held to maturity, at fair value | 1,400,000,000 | 712,000,000
Securities available-for-sale | 7,100,000,000 | 7,300,000,000
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 | 55,000,000 | 98,000,000
Maximum loss exposure, contractual funding commitments | 0 | 4,000,000
Loans and leases | 55,000,000 | 94,000,000
Commercial loan troubled debt restructurings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 0 | 0
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 | $ 167,000,000 | $ 167,000,000

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