Capital and Risk-Based Capital and Leverage Ratios for the Bancorp and its Significant Subsidiary Banks (Detail) - USD ($) $ in Millions		Dec. 31, 2015		Dec. 31, 2014	[2]
Fifth Third Bancorp
Risk Based Ratios
CET1 capital (to risk-weighted assets)	[1]	9.82%
Tier I risk-based capital (to risk-weighted assets)		10.93%	[1]	10.83%
Total risk-based capital (to risk-weighted assets)		14.13%	[1]	14.33%
Tier I leverage (to average assets)		9.54%	[1]	9.66%
Risk Based Capital
CET1 capital (to risk-weighted assets)	[1]	$ 11,917
Tier I risk-based capital (to risk-weighted assets)		13,260	[1]	$ 12,764
Total risk-based capital (to risk weighted assets)		17,134	[1]	16,895
Tier I leverage (to average assets)		$ 13,260	[1]	$ 12,764
Fifth Third Bank
Risk Based Ratios
CET1 capital (to risk-weighted assets)	[1]	11.92%
Tier I risk-based capital (to risk-weighted assets)		11.92%	[1]	11.85%
Total risk-based capital (to risk-weighted assets)		13.12%	[1]	13.10%
Tier I leverage (to average assets)		10.43%	[1]	10.58%
Risk Based Capital
CET1 capital (to risk-weighted assets)	[1]	$ 14,216
Tier I risk-based capital (to risk-weighted assets)		14,216	[1]	$ 13,760
Total risk-based capital (to risk weighted assets)		15,642	[1]	15,213
Tier I leverage (to average assets)		$ 14,216	[1]	$ 13,760

[1] Under the U.S. banking agencies’ Basel III Final Rule, assets and credit equivalent amounts of off-balance sheet exposures are calculated according to the standardized approach for risk-weighted assets. The resulting weighted values are added together resulting in the total risk-weighted assets.

[2] These capital amounts and ratios were calculated under the Supervisory Agencies general risk-based capital rules (Basel I) which were in effect prior to January 1, 2015.