Income Taxes (Reconciliation of the Beginning and Ending Amounts of the Bancorp's Unrecognized Tax Benefits) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Unrecognized tax benefits at January 1		$ 55	[1]	$ 34	[1]	$ 24
Gross increases for tax positions taken during prior period		25		20		17
Gross decreases for tax positions taken during prior period		(3)		(1)		(1)
Gross increases for tax positions taken during current period		6		8		3
Settlements with taxing authorities		(9)		(5)		(7)
Lapse of applicable statute of limitations		(9)		(1)		(2)
Unrecognized tax benefits at December 31	[1]	$ 65		$ 55		$ 34

[1] With the exception of $6 and $5 in 2019 and 2018, respectively, all amounts represent unrecognized tax benefits that, if recognized, would affect the annual effective tax rate.