Regulatory Requirements and Other Restrictions Regulatory Requirements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Truist Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tangible Capital Required for Capital Adequacy to Tangible Assets	4.00%
Banking Regulation, Supplementary Leverage Ratio, Capital Adequacy, Minimum	3.00%
CET1 Capital:
Actual Capital, Ratio	9.60%	10.00%
Actual Capital, Amount	$ 37,524	$ 37,869
Tier 1 Capital:
Actual Capital, Ratio	11.30%	12.10%
Actual Capital, Amount	$ 44,194	$ 45,915
Total Capital:
Actual Capital, Ratio	13.20%	14.50%
Actual Capital, Amount	$ 51,518	$ 55,011
Leverage Capital:
Actual Capital, Ratio	8.70%	9.60%
Actual Capital, Amount	$ 44,194	$ 45,915
Actual Capital, Ratio	7.40%	8.70%
Supplementary Leverage Capital:
Actual Capital, Ratio	7.40%	8.70%
Actual Capital, Amount	$ 44,194	$ 45,915
Truist Financial Corporation | Min
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	6.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%
Stressed Capital Conservation Buffer	2.50%
Truist Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Banking Regulation, Capital Conservation Buffer, Capital Conserved, Minimum	2.50%
CET1 Capital:
Actual Capital, Ratio	10.50%	11.00%
Actual Capital, Amount	$ 39,908	$ 40,642
Tier 1 Capital:
Actual Capital, Ratio	10.50%	11.00%
Actual Capital, Amount	$ 39,908	$ 40,642
Total Capital:
Actual Capital, Ratio	12.00%	13.00%
Actual Capital, Amount	$ 45,562	$ 47,882
Leverage Capital:
Actual Capital, Ratio	8.00%	8.70%
Actual Capital, Amount	$ 39,908	$ 40,642
Actual Capital, Ratio	6.90%	7.50%
Supplementary Leverage Capital:
Actual Capital, Ratio	6.90%	7.50%
Actual Capital, Amount	$ 39,908	$ 40,642