Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings per share:
Net income attributable to Bancorp	$ 1,712	$ 1,481	$ 1,836
Dividends on preferred stock	75	67	37
Net income (loss) available to common shareholders	1,637	1,414	1,799
Less: Income allocated to participating securities	15	12	14
Net income allocated to common shareholders	1,622	1,402	1,785
Earnings per diluted share:
Net income available to common shareholders	1,637	1,414	1,799
Series G convertible preferred stock			18
Net income available to common shareholders plus assumed conversions	1,637	1,414	1,817
Less: Income allocated to participating securities	15	12	14
Net income allocated to common shareholders plus assumed conversions	$ 1,622	$ 1,402	$ 1,803
Earnings per share:
Net income allocated to common shareholders	798,628,173	833,116,349	869,462,977
Effect of dilutive securities:
Stock-based awards	9,000,000	10,000,000	8,000,000
Series G convertible preferred stock			18,000,000
Net income allocated to common shareholders	807,658,669	842,967,356	894,736,445
Earnings per share:
Net income allocated to common shareholders	$ 2.03	$ 1.68	$ 2.05
Earnings per diluted share:
Net income allocated to common shareholders plus assumed conversions	$ 2.01	$ 1.66	$ 2.02