Derivative Financial Instruments - Classifications and Hedging Relationships (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	$ 509,835	$ 333,012
Derivative Asset, Fair Value, Gross	2,728	2,453
Derivative Liability, Fair Value, Gross	(5,184)	(4,749)
Derivative Asset [Abstract]
Amounts subject to master netting arrangements and exchange traded derivatives	(1,344)	(1,223)
Cash collateral (received) posted for amounts subject to master netting arrangements	(579)	(546)
Net Amount in Consolidated Balance Sheets	805	684
Derivative Liability [Abstract]
Amounts subject to master netting arrangements and exchange traded derivatives	1,344	1,223
Cash collateral (received) posted for amounts subject to master netting arrangements	712	555
Net amount	(3,128)	(2,971)
Cash flow hedges | Interest rate contracts | Swap | Commercial loans
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	21,400	16,650
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	0	0
Fair value hedges | Interest rate contracts
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	27,895	23,490
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	(66)	(68)
Fair value hedges | Interest rate contracts | Swap | Long-term debt
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	19,268	16,393
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	(66)	(68)
Fair value hedges | Interest rate contracts | Swap | AFS securities
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	8,627	7,097
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	0	0
Not designated as hedges
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	460,540	292,872
Derivative Asset, Fair Value, Gross	2,728	2,453
Derivative Liability, Fair Value, Gross	(5,118)	(4,681)
Not designated as hedges | Client-related and other risk management
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	422,219	257,003
Derivative Asset, Fair Value, Gross	2,606	2,293
Derivative Liability, Fair Value, Gross	(5,005)	(4,592)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Swap
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	295,199	155,670
Derivative Asset, Fair Value, Gross	599	579
Derivative Liability, Fair Value, Gross	(2,620)	(2,665)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Options
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	44,020	29,840
Derivative Asset, Fair Value, Gross	164	172
Derivative Liability, Fair Value, Gross	(188)	(192)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Forward commitments
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	211	1,495
Derivative Asset, Fair Value, Gross	0	8
Derivative Liability, Fair Value, Gross	0	(2)
Not designated as hedges | Client-related and other risk management | Interest rate contracts | Other
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	3,337	3,823
Derivative Asset, Fair Value, Gross	0	1
Derivative Liability, Fair Value, Gross	0	0
Not designated as hedges | Client-related and other risk management | Equity contracts
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	36,590	33,185
Derivative Asset, Fair Value, Gross	1,058	644
Derivative Liability, Fair Value, Gross	(1,481)	(901)
Not designated as hedges | Client-related and other risk management | Credit Contract | Trading assets
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	120	140
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	0	0
Not designated as hedges | Client-related and other risk management | Credit Contract | Loans and leases
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	465	394
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	(1)	0
Not designated as hedges | Client-related and other risk management | Credit Contract | Risk participation agreements
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	7,473	6,824
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	(2)	(3)
Not designated as hedges | Client-related and other risk management | Credit Contract | Total Return Swap
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	1,802	1,729
Derivative Asset, Fair Value, Gross	62	81
Derivative Liability, Fair Value, Gross	(7)	(2)
Not designated as hedges | Client-related and other risk management | Foreign exchange contracts
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	23,940	19,022
Derivative Asset, Fair Value, Gross	284	364
Derivative Liability, Fair Value, Gross	(277)	(380)
Not designated as hedges | Client-related and other risk management | Commodity Contract
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	9,062	4,881
Derivative Asset, Fair Value, Gross	439	444
Derivative Liability, Fair Value, Gross	(429)	(447)
Not designated as hedges | Mortgage banking | Interest rate contracts
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	4,802	3,382
Derivative Asset, Fair Value, Gross	42	27
Derivative Liability, Fair Value, Gross	(16)	(23)
Not designated as hedges | Mortgage banking | Interest rate contracts | Swap
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	277	115
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	0	0
Not designated as hedges | Mortgage banking | Interest rate contracts | Options
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	400	400	[1]
Derivative Asset, Fair Value, Gross	1	1	[1]
Derivative Liability, Fair Value, Gross	0	0	[1]
Not designated as hedges | Mortgage banking | Interest rate contracts | Other
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	99	140
Derivative Asset, Fair Value, Gross	0	1
Derivative Liability, Fair Value, Gross	0	0
Not designated as hedges | Mortgage banking | Interest rate contracts | Interest rate lock commitments
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	1,426	999
Derivative Asset, Fair Value, Gross	2	1
Derivative Liability, Fair Value, Gross	(16)	(17)
Not designated as hedges | Mortgage banking | Interest rate contracts | When issued securities, forward rate agreements and forward commitments(1)
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	2,600	1,728	[1]
Derivative Asset, Fair Value, Gross	39	24	[1]
Derivative Liability, Fair Value, Gross	0	(6)	[1]
Not designated as hedges | Loan Servicing Rights | Interest rate contracts
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	33,519	32,487
Derivative Asset, Fair Value, Gross	80	133
Derivative Liability, Fair Value, Gross	(97)	(66)
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | Swap
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	14,605	14,566
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	0	0
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | Options
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	15,882	15,505	[1]
Derivative Asset, Fair Value, Gross	80	125	[1]
Derivative Liability, Fair Value, Gross	(89)	(48)	[1]
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | Other
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	2,161	1,532
Derivative Asset, Fair Value, Gross	0	0
Derivative Liability, Fair Value, Gross	(1)	(3)
Not designated as hedges | Loan Servicing Rights | Interest rate contracts | When issued securities, forward rate agreements and forward commitments(1)
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Notional Amount	871	884	[1]
Derivative Asset, Fair Value, Gross	0	8	[1]
Derivative Liability, Fair Value, Gross	$ (7)	$ (15)	[1]

[1] In the second quarter of 2023, Truist reclassified TBA MBS options into the options line item. Prior periods were reclassified to conform to the current presentation.