Loans and ACL - Allowance for Credit Losses (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Provision for credit losses		$ 500	$ 502
Commercial: | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1,404	1,409
Charge-Offs		(97)	(75)
Recoveries		32	13
Provision for credit losses		22	151
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	(1)	(1)
Ending balance		1,360	1,497
Commercial: | CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		616	224
Charge-Offs		(103)	(6)
Recoveries		7	1
Provision for credit losses		143	32
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	0
Ending balance		663	251
Commercial: | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		174	46
Charge-Offs		0	0
Recoveries		0	1
Provision for credit losses		24	40
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	0
Ending balance		198	87
Consumer: | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		298	399
Charge-Offs		(1)	(1)
Recoveries		1	2
Provision for credit losses		(76)	13
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	(81)
Ending balance		222	332
Consumer: | Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		89	90
Charge-Offs		(3)	(2)
Recoveries		5	6
Provision for credit losses		(1)	(7)
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	0
Ending balance		90	87
Consumer: | Indirect auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		942	981
Charge-Offs		(154)	(127)
Recoveries		28	26
Provision for credit losses		107	100
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	13
Ending balance		923	993
Consumer: | Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		890	770
Charge-Offs		(165)	(105)
Recoveries		28	17
Provision for credit losses		206	98
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	(1)
Ending balance		959	779
Consumer: | Student
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	[2]		98
Charge-Offs	[2]		(5)
Recoveries	[2]		0
Provision for credit losses	[2]		5
Allowance for Loan and Lease Losses, Adjustments, Other	[1],[2]		0
Ending balance	[2]		98
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		385	360
Charge-Offs		(77)	(51)
Recoveries		9	9
Provision for credit losses		71	40
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	0	(3)
Ending balance		388	355
ALLL
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		4,798	4,377
Charge-Offs		(600)	(372)
Recoveries		110	75
Provision for credit losses		496	472
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	(1)	(73)
Ending balance		4,803	4,479
RUFC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		295	272
Charge-Offs		0	0
Recoveries		0	0
Provision for credit losses		4	10
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	(2)	0
Ending balance		297	282
ACL
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5,093	4,649
Charge-Offs		(600)	(372)
Recoveries		110	75
Provision for credit losses		500	482
Allowance for Loan and Lease Losses, Adjustments, Other	[1]	(3)	(73)
Ending balance		$ 5,100	$ 4,761

[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.