Loans and ACL - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022	Jun. 30, 2023		Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses	$ 538		$ 171	$ 1,040		$ 76
Commercial: | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,497		1,319	1,409		1,426
Charge-Offs	(107)		(17)	(182)		(48)
Recoveries	13		13	26		30
Provision for credit losses	133		42	284		(51)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(1)	[1]	0	[1]
Ending balance	1,536		1,357	1,536		1,357
Commercial: | CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	251		283	224		350
Charge-Offs	(35)		(1)	(41)		(2)
Recoveries	0		6	1		7
Provision for credit losses	186		(51)	218		(118)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	402		237	402		237
Commercial: | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	87		53	46		52
Charge-Offs	0		0	0		(1)
Recoveries	0		1	1		2
Provision for credit losses	22		(4)	62		(3)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	109		50	109		50
Consumer: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	332		310	399		308
Charge-Offs	(1)		(2)	(2)		(4)
Recoveries	2		4	4		10
Provision for credit losses	(13)		15	0		13
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(81)	[1]	0	[1]
Ending balance	320		327	320		327
Consumer: | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	87		88	90		96
Charge-Offs	(2)		(3)	(4)		(4)
Recoveries	5		6	11		11
Provision for credit losses	(5)		(3)	(12)		(15)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	85		88	85		88
Consumer: | Indirect auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	993		957	981		1,022
Charge-Offs	(115)		(77)	(242)		(179)
Recoveries	31		26	57		49
Provision for credit losses	72		46	172		60
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	13	[1]	0	[1]
Ending balance	981		952	981		952
Consumer: | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	779		697	770		714
Charge-Offs	(104)		(100)	(209)		(176)
Recoveries	20		20	37		41
Provision for credit losses	113		111	211		149
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(1)	[1]	0	[1]
Ending balance	808		728	808		728
Consumer: | Student
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	98		115	98		117
Charge-Offs	(103)		(4)	(108)		(10)
Recoveries	0		0	0		0
Provision for credit losses	5		(10)	10		(7)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	(1)	0	[1]	0	[1]
Ending balance	0		100	0		100
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	355		348	360		350
Charge-Offs	(53)		(40)	(104)		(81)
Recoveries	9		9	18		18
Provision for credit losses	54		31	94		61
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	(3)	[1]	0	[1]
Ending balance	365		348	365		348
ALLL
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,479		4,170	4,377		4,435
Charge-Offs	(520)		(244)	(892)		(505)
Recoveries	80		85	155		168
Provision for credit losses	567		177	1,039		89
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	(1)	(73)	[1]	0	[1]
Ending balance	4,606		4,187	4,606		4,187
RUFC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	282		253	272		260
Charge-Offs	0		0	0		0
Recoveries	0		0	0		0
Provision for credit losses	(9)		(6)	1		(13)
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	0	0	[1]	0	[1]
Ending balance	273		247	273		247
ACL
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,761		4,423	4,649		4,695
Charge-Offs	(520)		(244)	(892)		(505)
Recoveries	80		85	155		168
Provision for credit losses	558		171	1,040		76
Allowance for Loan and Lease Losses, Adjustments, Other	0	[1]	(1)	(73)	[1]	0	[1]
Ending balance	$ 4,879		$ 4,434	$ 4,879		$ 4,434

[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.