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, 2018		Dec. 31, 2017		Dec. 31, 2016
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Unrecognized tax benefits at January 1		$ 34	[1]	$ 24	[1]	$ 13
Gross increases for tax positions taken during prior period		20		17		9
Gross decreases for tax positions taken during prior period		(1)		(1)		0
Gross increases for tax positions taken during current period		8		3		2
Settlements with taxing authorities		(5)		(7)		0
Lapse of applicable statute of limitations		(1)		(2)		0
Unrecognized tax benefits at December 31	[1]	$ 55		$ 34		$ 24

[1] (a ) With the exception of $5 in 2018 , all a mounts represent unrecognized tax benefits that, if recognized, would affect the annual effective tax rat e.