Borrowings - Schedule of Long Term Debt, Interest Rates and Maturity Dates (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		$ 69,895	$ 43,203
Truist Financial Corporation | Senior notes | Fixed rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		16,059	14,107
Truist Financial Corporation | Senior notes | Floating rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		999	999
Truist Financial Corporation | Subordinated notes | Fixed rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[1]	1,895	1,882
Truist Financial Corporation | Capital Notes
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[1]	626	625
Truist Financial Corporation | Structured Notes
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[2]	12	12
Truist Bank | Senior notes | Fixed rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		5,246	6,982
Truist Bank | Senior notes | Floating rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		1,249	1,749
Truist Bank | Subordinated notes | Fixed rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[1]	4,795	4,767
Truist Bank | FHLB advances | Fixed rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		2	2
Truist Bank | FHLB advances | Floating rate
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		37,800	10,800
Truist Bank | Other long-term debt
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[3]	$ 1,212	$ 1,278

[1] Subordinated and capital notes with a remaining maturity of one year or greater qualify under the risk-based capital guidelines as Tier 2 supplementary capital, subject to certain limitations.

[2] Consist of notes with various terms that include fixed or floating rate interest or returns that are linked to an equity index.

[3] Includes debt associated with finance leases, tax credit investments, and other.