Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Entity Listings [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Entity File Number	1-10853
Entity Registrant Name	TRUIST FINANCIAL CORPORATION
Entity Incorporation, State or Country Code	NC
Entity Tax Identification Number	56-0939887
Entity Address, Address Line One	214 North Tryon Street
Entity Address, City or Town	Charlotte,
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202
City Area Code	(336)
Local Phone Number	733-2000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,342,769,369
Entity Central Index Key	0000092230
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Transition Report	false
Entity Public Float			$ 37,500
Common Stock, $5 par value
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, $5 par value
Trading Symbol	TFC
Security Exchange Name	NYSE
Series F Preferred Stock
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shares each representing 1/1,000th interest in a share of Series F Non-Cumulative Perpetual Preferred Stock
Trading Symbol	TFC.PF
Security Exchange Name	NYSE
Series G Preferred Stock
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shares each representing 1/1,000th interest in a share of Series G Non-Cumulative Perpetual Preferred Stock
Trading Symbol	TFC.PG
Security Exchange Name	NYSE
Series H Preferred Stock
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shares each representing 1/1,000th interest in a share of Series H Non-Cumulative Perpetual Preferred Stock
Trading Symbol	TFC.PH
Security Exchange Name	NYSE
Series I
Entity Listings [Line Items]
Title of 12(b) Security	Depositary Shares each representing 1/4,000th interest in a share of Series I Perpetual Preferred Stock
Trading Symbol	TFC.PI
Security Exchange Name	NYSE
Series J
Entity Listings [Line Items]
Title of 12(b) Security	5.853% Fixed-to-Floating Rate Normal Preferred Purchase Securities each representing 1/100th interest in a share of Series J Perpetual Preferred Stock
Trading Symbol	TFC.PJ
Security Exchange Name	NYSE