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Loan Servicing - Residential Mortgage Servicing Activities (Details) - Residential mortgage - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
UPB of residential mortgage loan servicing portfolio	$ 298,658	$ 285,966
UPB of residential mortgage loans serviced for others, primarily agency conforming fixed rate	$ 240,764	$ 228,383

X

- Definition

Represents the unpaid principal balance of total residential mortgage servicing portfolio. This includes the unpaid principal balances held for investment included on the balance sheet as well as the portion serviced for others representing the balances sold to third-party investors.

+ References

No definition available.

+ Details

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Namespace Prefix:	tfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481229/860-50-50-2

+ Details

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Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: