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	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings per share:
Net income attributable to Bancorp	$ 439	$ 591	$ 756	$ 1,013
Dividends on preferred stock	23	9	32	18
Net income (loss) available to common shareholders	416	582	724	995
Less: Income allocated to participating securities	4	4	6	7
Net income allocated to common shareholders	412	578	718	988
Earnings per diluted share:
Net income available to common shareholders	416	582	724	995
Series G convertible preferred stock		9		18
Net income available to common shareholders plus assumed conversions	416	591	724	1,013
Less: Income allocated to participating securities	4	4	6	7
Net income allocated to common shareholders plus assumed conversions	$ 412	$ 587	$ 718	$ 1,006
Earnings per share:
Net income allocated to common shareholders	838,000,000	859,000,000	842,000,000	865,000,000
Effect of dilutive securities:
Stock-based awards	10,000,000	6,000,000	11,000,000	6,000,000
Series G convertible preferred stock		36,000,000		36,000,000
Net income allocated to common shareholders plus assumed converstions	848,000,000	901,000,000	853,000,000	907,000,000
Earnings per share:
Net income allocated to common shareholders	$ 0.49	$ 0.67	$ 0.85	$ 1.14
Earnings per diluted share:
Net income allocated to common shareholders plus assumed conversions	$ 0.49	$ 0.65	$ 0.84	$ 1.11