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Benefit Plans - Schedule of Estimated Future Benefit Payments (Inactive Plans) - (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Heritage BBT | Qualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 139
2021 153
2022 167
2023 181
2024 196
2025-2029 1,219
Heritage BBT | Nonqualified Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 16
2021 17
2022 18
2023 19
2024 20
2025-2029 120
SunTrust Banks Inc. | Qualified Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 183
2021 162
2022 162
2023 160
2024 158
2025-2029 775
SunTrust Banks Inc. | Nonqualified Plans  
Defined Benefit Plan Disclosure [Line Items]  
2020 10
2021 6
2022 7
2023 6
2024 5
2025-2029 $ 21