Capital Actions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Proceeds from issuance of preferred stock		$ 242	$ 0
Open Market Share Repurchase
Stock repurchase, value	$ 50
Stock repurchase, shares	1,667,735
Repurchase Date	Jul. 29, 2019
Repurchase Date, secondary	Jul. 30, 2019
Settlement date	Jul. 31, 2019
Settlement date, secondary	Aug. 01, 2019
Preferred Stock, Series K
Preferred stock, issued	10,000	10,000
Preferred stock, liquidation preference	$ 25,000	$ 25,000
Proceeds from issuance of preferred stock	$ 242
Depositary shares	10,000,000	10,000,000
Preferred stock, redemption terms	Subject to any required regulatory approval, the Bancorp may redeem the Series K preferred shares at its option (i) in whole or in part, on any dividend payment date on or after September 30, 2024 and (ii) in whole, but not in part, at any time following a regulatory capital event.
Class B Preferred stock, Series A
Preferred stock, issued	200,000	200,000
Preferred stock, liquidation preference	$ 1,000	$ 1,000