Regulatory Requirements and Other Restrictions Regulatory Requirements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Truist Financial Corporation
CET1 Capital:
Actual Capital, Ratio	9.50%	10.20%
Actual Capital, Amount	$ 35,643	$ 18,405
Tier 1 Capital:
Actual Capital, Ratio	10.80%	11.80%
Actual Capital, Amount	$ 40,743	$ 21,456
Total Capital:
Actual Capital, Ratio	12.60%	13.80%
Actual Capital, Amount	$ 47,511	$ 24,963
Leverage Capital:
Actual Capital, Ratio	14.70%	9.90%
Actual Capital, Amount	$ 40,743	$ 21,456
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%
Tangible Capital Required for Capital Adequacy to Tangible Assets	4.00%
Truist Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer	2.50%
CET1 Capital:
Actual Capital, Ratio	10.60%	11.20%
Actual Capital, Amount	$ 38,739	$ 19,571
Tier 1 Capital:
Actual Capital, Ratio	10.60%	11.20%
Actual Capital, Amount	$ 38,739	$ 19,571
Total Capital:
Actual Capital, Ratio	12.00%	13.20%
Actual Capital, Amount	$ 43,984	$ 23,049
Leverage Capital:
Actual Capital, Ratio	14.50%	9.30%
Actual Capital, Amount	$ 38,739	$ 19,571