Loans and ACL - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses	$ 497		$ 234	$ 1,537		$ 310
Commercial: | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,536		1,357	1,409		1,426
Charge-Offs	(98)		(51)	(280)		(99)
Recoveries	28		43	54		73
Provision for credit losses	(114)		(48)	170		(99)
Allowance for Loan and Lease Losses, Adjustments, Other	(1)	[1]	0	(2)	[1]	0	[1]
Ending balance	1,351		1,301	1,351		1,301
Commercial: | CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	402		237	224		350
Charge-Offs	(77)		0	(118)		(2)
Recoveries	2		0	3		7
Provision for credit losses	278		(3)	496		(121)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	605		234	605		234
Commercial: | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	109		50	46		52
Charge-Offs	0		0	0		(1)
Recoveries	0		2	1		4
Provision for credit losses	56		(5)	118		(8)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	165		47	165		47
Consumer: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	320		327	399		308
Charge-Offs	(8)		(4)	(10)		(8)
Recoveries	1		3	5		13
Provision for credit losses	(12)		50	(12)		63
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(81)	[1]	0	[1]
Ending balance	301		376	301		376
Consumer: | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	85		88	90		96
Charge-Offs	(4)		(3)	(8)		(7)
Recoveries	7		8	18		19
Provision for credit losses	(2)		(10)	(14)		(25)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	86		83	86		83
Consumer: | Indirect auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	981		952	981		1,022
Charge-Offs	(135)		(103)	(377)		(282)
Recoveries	25		21	82		70
Provision for credit losses	74		96	246		156
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	13	[1]	0	[1]
Ending balance	945		966	945		966
Consumer: | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	808		728	770		714
Charge-Offs	(120)		(109)	(329)		(285)
Recoveries	20		21	57		62
Provision for credit losses	158		115	369		264
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(1)	[1]	0	[1]
Ending balance	866		755	866		755
Consumer: | Student
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			100	98	[2]	117
Charge-Offs			(7)	(108)	[2]	(17)
Recoveries			0	0	[2]	0
Provision for credit losses			0	10	[2]	(7)
Allowance for Loan and Lease Losses, Adjustments, Other			0	0	[1],[2]	0	[1]
Ending balance	0	[2]	93	0	[2]	93
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	365		348	360		350
Charge-Offs	(55)		(42)	(159)		(123)
Recoveries	9		8	27		26
Provision for credit losses	55		36	149		97
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(3)	[1]	0	[1]
Ending balance	374		350	374		350
ALLL
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,606		4,187	4,377		4,435
Charge-Offs	(497)		(319)	(1,389)		(824)
Recoveries	92		106	247		274
Provision for credit losses	493		231	1,532		320
Allowance for Loan and Lease Losses, Adjustments, Other	(1)	[1]	0	(74)	[1]	0	[1]
Ending balance	4,693		4,205	4,693		4,205
RUFC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	273		247	272		260
Charge-Offs	0		0	0		0
Recoveries	0		0	0		0
Provision for credit losses	4		3	5		(10)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	277		250	277		250
ACL
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,879		4,434	4,649		4,695
Charge-Offs	(497)		(319)	(1,389)		(824)
Recoveries	92		106	247		274
Provision for credit losses	497		234	1,537		310
Allowance for Loan and Lease Losses, Adjustments, Other	(1)	[1]	0	(74)	[1]	0	[1]
Ending balance	$ 4,970		$ 4,455	$ 4,970		$ 4,455

[1] Includes the amounts for the ALLL for PCD acquisitions, the impact of adopting the Troubled Debt Restructurings and Vintage Disclosures accounting standard, and other activity.

[2] Truist sold its student loan portfolio at the end of the second quarter of 2023. Charge-offs include $98 million related to the sale.