Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases	$ 60,519	$ 57,417
Mortgage banking and title income	23	68	$ 154
Mortgage banking and title income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage banking and title income	4	4	$ 4
Sale of mortgage servicing rights		21
Gain on sale of mortgage servicing rights		$ 12
First Horizon Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans and leases	$ 34

Gain (Loss) on Sale of Mortgage Servicing Rights

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- Definition

Sale of Mortgage Servicing Rights

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Subsection Instruction 3
-Publisher SEC

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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