Long-Term Debt - Schedule of Long Term Debt, Interest Rates and Maturity Dates (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		$ 35,913	$ 39,597
Truist Financial Corporation
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount		$ 16,504	18,890
Truist Financial Corporation | Senior notes | Fixed rate
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2022
Maturity Date Range, End		Dec. 31, 2030
Effective Rate (1)	[1]	2.32%
Long-term Debt, Carrying Amount		$ 14,269	15,984
Truist Financial Corporation | Senior notes | Fixed rate | Min
Debt Instruments [Line Items]
Stated Rate		0.45%
Truist Financial Corporation | Senior notes | Fixed rate | Max
Debt Instruments [Line Items]
Stated Rate		6.00%
Truist Financial Corporation | Senior notes | Floating rate
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2022
Maturity Date Range, End		Dec. 31, 2022
Effective Rate (1)	[1]	0.78%
Long-term Debt, Carrying Amount		$ 350	900
Truist Financial Corporation | Senior notes | Floating rate | Min
Debt Instruments [Line Items]
Stated Rate		0.78%
Truist Financial Corporation | Senior notes | Floating rate | Max
Debt Instruments [Line Items]
Stated Rate		0.78%
Truist Financial Corporation | Subordinated notes | Fixed rate
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2022
Maturity Date Range, End		Dec. 31, 2029
Effective Rate (1)	[1]	3.78%
Long-term Debt, Carrying Amount		$ 1,254	1,283
Truist Financial Corporation | Subordinated notes | Fixed rate | Min
Debt Instruments [Line Items]
Stated Rate		3.88%
Truist Financial Corporation | Subordinated notes | Fixed rate | Max
Debt Instruments [Line Items]
Stated Rate		6.00%
Truist Financial Corporation | Capital Notes
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2027
Maturity Date Range, End		Dec. 31, 2028
Effective Rate (1)	[1]	1.64%
Long-term Debt, Carrying Amount		$ 620	615
Truist Financial Corporation | Capital Notes | Min
Debt Instruments [Line Items]
Stated Rate		0.82%
Truist Financial Corporation | Capital Notes | Max
Debt Instruments [Line Items]
Stated Rate		1.11%
Truist Financial Corporation | Structured Notes
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 31, 2023
Maturity Date Range, End		Dec. 31, 2023
Long-term Debt, Carrying Amount	[2]	$ 11	108
Truist Bank | Senior notes | Fixed rate
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2022
Maturity Date Range, End		Dec. 31, 2025
Effective Rate (1)	[1]	1.78%
Long-term Debt, Carrying Amount		$ 10,794	11,907
Truist Bank | Senior notes | Fixed rate | Min
Debt Instruments [Line Items]
Stated Rate		0.25%
Truist Bank | Senior notes | Fixed rate | Max
Debt Instruments [Line Items]
Stated Rate		4.05%
Truist Bank | Senior notes | Floating rate
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2022
Maturity Date Range, End		Dec. 31, 2023
Effective Rate (1)	[1]	0.66%
Long-term Debt, Carrying Amount		$ 1,150	1,567
Truist Bank | Senior notes | Floating rate | Min
Debt Instruments [Line Items]
Stated Rate		0.75%
Truist Bank | Senior notes | Floating rate | Max
Debt Instruments [Line Items]
Stated Rate		0.78%
Truist Bank | Subordinated notes | Fixed rate
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2025
Maturity Date Range, End		Dec. 31, 2030
Effective Rate (1)	[1]	3.02%
Long-term Debt, Carrying Amount		$ 5,043	5,142
Truist Bank | Subordinated notes | Fixed rate | Min
Debt Instruments [Line Items]
Stated Rate		2.25%
Truist Bank | Subordinated notes | Fixed rate | Max
Debt Instruments [Line Items]
Stated Rate		3.80%
Truist Bank | FHLB advances
Debt Instruments [Line Items]
Maturity Date Range, Start		Jan. 01, 2023
Maturity Date Range, End		Dec. 31, 2034
Effective Rate (1)	[1]	5.34%
Long-term Debt, Carrying Amount		$ 863	878
Truist Bank | FHLB advances | Min
Debt Instruments [Line Items]
Stated Rate		0.00%
Truist Bank | FHLB advances | Max
Debt Instruments [Line Items]
Stated Rate		5.36%
Truist Bank | Other long-term debt
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[3]	$ 1,263	1,014
Nonbank | Other long-term debt
Debt Instruments [Line Items]
Long-term Debt, Carrying Amount	[4]	$ 296	$ 199

[1] Includes the impact of debt issuance costs and purchase accounting, and excludes hedge accounting impacts.

[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.

[4] Includes debt associated with structured real estate leases.