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Variable Interest Entities - Summary of VIE Not Consolidated By FHN (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Liability Recognized | $ 80,598 | $ 75,902
Trading securities: | 1,601 | 1,176
Securities held to maturity | 712 | 10
Term borrowings | 1,590 | 1,670
Low income housing partnerships |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 382 | 338
Maximum loss exposure, contractual funding commitments | 129 | 132
Low income housing partnerships | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 129 | 132
Low income housing partnerships | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Maximum loss exposure, current investments | 253 | 206
Other tax credit investments |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 77 | 64
Other tax credit investments | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 56 | 42
Small issuer trust preferred holdings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 195 | 210
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 | 32
Loans, net of unearned income | 112 | 112
Trading securities: | 2 | 2
Term borrowings | 87 | 82
On-balance sheet trust preferred securitization | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Liability Recognized | 87 | 82
Holdings of agency mortgage-backed securities |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 8,550 | 7,063
Trading securities: | 526 | 845
Securities held to maturity | 712 |
Securities available for sale at fair value | 7,300 | 6,200
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 | 98 | 186
Maximum loss exposure, contractual funding commitments | 4 | 10
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 | 94 | 176
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 | $ 287

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