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Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Mortgage Banking [Line Items] |  |  |  |  |
Net loans and leases | $ 55,872 |  | $ 55,872 |  | $ 57,269
Mortgage banking and title income | 38 | $ 4 | 91 | $ 7 |
First Horizon Bank |  |  |  |  |
Mortgage Banking [Line Items] |  |  |  |  |
Net loans and leases | 49 |  | 49 |  |
Mortgage banking and title income |  |  |  |  |
Mortgage Banking [Line Items] |  |  |  |  |
Mortgage banking and title income | $ 0 |  | $ 1 |  |

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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Subsection Instruction 3 + Details
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- Definition Amount excluding accrued interest, after allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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