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v3.21.2

Variable Interest Entities - Summary Of VIE Not Consolidated By FHN (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total liabilities | $ 79,343 | $ 75,902
Trading securities | 1,035 | 1,176
Term borrowings | 1,672 | 1,670
Securities available-for-sale | 8,388 | 8,047
Low income housing partnerships |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 355 | 338
Maximum loss exposure, contractual funding commitments | 128 | 132
Low income housing partnerships | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 128 | 132
Low income housing partnerships | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Maximum loss exposure, current investments | 227 | 206
Other tax credit investments |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 67 | 64
Other tax credit investments | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 42 | 42
Small issuer trust preferred holdings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 206 | 210
Small issuer trust preferred holdings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
On-balance sheet trust preferred securitization |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 31 | 32
Loans and leases | 112 | 112
Trading securities | 2 | 2
Term borrowings | 83 | 82
On-balance sheet trust preferred securitization | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 83 | 82
Holdings of agency mortgage-backed securities |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 7,115 | 7,063
Trading securities | 600 | 800
Securities available-for-sale | 6,500 | 6,200
Holdings of agency mortgage-backed securities | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
Commercial loan troubled debt restructurings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 164 | 186
Maximum loss exposure, contractual funding commitments | 6 | 10
Loans and leases | 158 | 176
Commercial loan troubled debt restructurings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 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] |  |
Total liabilities | $ 287 | $ 287

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