Business Combinations - Narative (Details) - USD ($)		12 Months Ended
	Dec. 06, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Issued in business combination		$ 33,546,000,000	$ 0	$ 0
Common Stock
Business Acquisition [Line Items]
Issued in business combinations (in shares)		575,067,000
Issued in business combination		$ 2,875,000,000
Preferred Stock
Business Acquisition [Line Items]
Issued in business combination	$ 2,000,000,000.0	$ 2,045,000,000
Truist Financial Corporation
Business Acquisition [Line Items]
Business Combination Equity Interest Received	1.295