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Mortgage Banking Activity - Residential Mortgage Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 57,269	$ 30,861
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Beginning Balance	594
Acquired	320
Originations and purchases	2,499
Sales, net of gains	(2,405)
Mortgage loans transferred to held for investment	(9)
Ending Balance	1,022
First Horizon Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	55
Mortgage loans
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Beginning Balance	4
Ending Balance	$ 409

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Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Acquired

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Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Mortgage Loans Transferred to Held-For-Investment

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Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Originations and Purchases

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 1
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Amount, after allowance for bad debt, of deductions to loan receivables held-for-sale that are not part of a disposal group.

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