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Benefit Plans - Changes in Projected Benefit Obligations (Details) - Heritage BBT - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Service cost $ 214 $ 238 $ 200
Interest cost 226 201 192
Qualified Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning balance 4,697 4,939  
Service cost 199 222  
Interest cost 209 186  
Actuarial (gain) loss 1,049 (537)  
Benefits paid (125) (113)  
Acquisitions 0 0  
Projected benefit obligation, ending balance 6,029 4,697 4,939
Accumulated benefit obligation, end of year $ 5,069 $ 4,035  
Weighted average assumptions used to determine projected benefit obligations:      
Weighted average assumed discount rate 3.45% 4.43%  
Assumed rate of annual compensation increases 4.50% 4.50%  
Nonqualified Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning balance $ 386 $ 387  
Service cost 15 16  
Interest cost 17 15  
Actuarial (gain) loss 79 (19)  
Benefits paid (13) (13)  
Acquisitions 0 0  
Projected benefit obligation, ending balance 484 386 $ 387
Accumulated benefit obligation, end of year $ 359 $ 293  
Weighted average assumptions used to determine projected benefit obligations:      
Weighted average assumed discount rate 3.45% 4.43%  
Assumed rate of annual compensation increases 4.50% 4.50%