Loans and ACL - Summary of Modifications' Financial Effect (Details)	3 Months Ended
Mar. 31, 2025 Rate	Mar. 31, 2024 Rate
Commercial: \| Commercial and industrial \| Renewals
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	7 months	11 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification	0.20%	0.50%
Commercial: \| Commercial and industrial \| Payment Delays
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	180 days	90 days
Commercial: \| CRE \| Renewals
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	18 months	6 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification	0.03%	0.50%
Commercial: \| CRE \| Payment Delays
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		90 days
Commercial: \| Commercial construction \| Renewals
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	12 months	11 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification		0.10%
Consumer: \| Residential mortgage \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	90 months	105 months
Consumer: \| Residential mortgage \| Payment Delays
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	224 days	193 days
Consumer: \| Residential mortgage \| Combination - Capitalization and Term Extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	99 months	85 months
Consumer: \| Residential mortgage \| Combination - Capitalization, Interest Rate and Term Extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		134 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification		(0.50%)
Consumer: \| Home equity \| Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		275 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification		(3.00%)
Consumer: \| Indirect auto \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	26 months	26 months
Consumer: \| Indirect auto \| Payment Delays
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	244 days	186 days
Consumer: \| Indirect auto \| Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		33 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification		(3.00%)
Consumer: \| Other consumer \| Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification	25 months	26 months
Consumer: \| Other consumer \| Extended Maturity and Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Term Increase from Modification		61 months
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification		(0.025%)
Consumer: \| Credit card \| Contractual Interest Rate Adjustments
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modified, Weighted Average Interest Rate Adjustment from Modification	(17.00%)

Financing Receivable, Modified, Weighted Average Interest Rate Increase from Modification

No definition available.

Name:	tfc_FinancingReceivableModifiedWeightedAverageInterestRateIncreaseFromModification
Namespace Prefix:	tfc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-34

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration