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Derivative Financial Instruments - Terminated Cash Flow and Fair Value Hedges (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Deferred gains recorded in AOCI	$ 318	$ 335
Swaps hedging commercial loans
Derivative [Line Items]
Net unrecognized after-tax gain (loss) on active hedges recorded in AOCI	$ (1,035)	$ (173)
Maximum length of time over which forecasted cash flows are hedged	4 years	5 years
Fair Value Hedges
Derivative [Line Items]
Net unrecognized pre-tax gain (loss) on terminated hedges	$ 38	$ (56)

X

- Definition

Max time period which Truist is hedging a portion of the var. in future cash flows for forecasted transactions excluding those transactions relating to the payment of var. int. on existing instruments

+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

UnrecognizedPretaxGainLossOnTerminatedHedges

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) in accumulated other comprehensive income (AOCI) for derivative hedging forecasted acquisition of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

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