Condensed Statements of Income - Parent Company Only (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Dividends from subsidiaries:
Nonbank subsidiaries	$ 1,100		$ 859
Total interest income	4,030		3,973		4,107
Expenses
Interest	451		412		512
Other	178		185		169
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries	2,028		2,598		2,210
Applicable income tax benefit	(545)		(772)		(636)
Net income attributable to Bancorp	1,481		1,836		1,576
Parent Company Only
Dividends from subsidiaries:
Nonbank subsidiaries	1,094	[1]	859	[1]	1,959	[1]
Interest on loans to subsidiaries	14		14		17
Total interest income	1,108		873		1,976
Expenses
Interest	163		178		215
Other	17		36		61
Total expenses	180		214		276
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries	928		659		1,700
Applicable income tax benefit	62		74		96
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries	990		733		1,796
Change in undistributed earnings (loss)	491		1,103		(220)
Net income attributable to Bancorp	$ 1,481		$ 1,836		$ 1,576

[1]  The Bancorp’s indirect banking subsidiary paid dividends to the Bancorp’s direct nonbank subsidiary holding company of $1.1 billion, $859 million and $2.0 billion for the years ended December 31, 2014, 2013 and 2012, respectively.