Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings per share:
Net income attributable to Bancorp	$ 1,836	$ 1,576	$ 1,297
Dividends on preferred stock	37	35	203
Net income (loss) available to common shareholders	1,799	1,541	1,094
Less: Income allocated to participating securities	(14)	(10)	(6)
Net income allocated to common shareholders	1,785	1,531	1,088
Earnings per diluted share:
Net income available to common shareholders	1,799	1,541	1,094
Series G convertible preferred stock	18	35	35
Net income available to common shareholders plus assumed conversions	1,817	1,576	1,129
Less: Income allocated to participating securities	(14)	(10)	(6)
Net income allocated to common shareholders plus assumed conversions	$ 1,803	$ 1,566	$ 1,123
Earnings per share:
Net income allocated to common shareholders	869,000,000	904,000,000	906,000,000
Effect of dilutive securities:
Stock-based awards	8,000,000	6,000,000	6,000,000
Series G convertible preferred stock	18,000,000	36,000,000	36,000,000
Warrant related to Series F preferred stock			2,000,000
Net income allocated to common shareholders plus assumed converstions	895,000,000	946,000,000	950,000,000
Earnings per share:
Net income allocated to common shareholders	$ 2.05	$ 1.69	$ 1.20
Earnings per diluted share:
Net income allocated to common shareholders plus assumed conversions	$ 2.02	$ 1.66	$ 1.18