Capital Actions - Additional Information (Detail) (March 2014 Repurchase Program) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
March 2014 Repurchase Program
Capital Actions
Repurchase Shares Authorized	100

Number of common stock shares authorized by the Board of Directors to be repurchased.

No definition available.

Name:	fitb_Repurchasesharesauthorized
Namespace Prefix:	fitb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration