Condensed Statement of Comprehensive Income - Parent Company Only (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 1,836	$ 1,576	$ 1,297
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period	(8)	24	58
Other Comprehensive Income (Loss) Net Of Tax	(293)	(95)	156
Comprehensive income	1,533	1,479	1,454
Comprehensive income attributable to Bancorp	1,543	1,481	1,453
Parent Company [Member]
Net income	1,836	1,576	1,297
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period		3	2
Other Comprehensive Income (Loss) Net Of Tax		3	2
Comprehensive income	$ 1,836	$ 1,579	$ 1,299