Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Detail) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings per share:
Net income attributable to Bancorp	$ 337	$ 192	$ 602	$ 182
Dividends on preferred stock	9	62	185	125
Net income (loss) available to common shareholders	328	130	417	57
Less: Income allocated to participating securities	2	1	2
Net income allocated to common shareholders	326	129	415	57
Earnings per diluted share:
Net income available to common shareholders	328	130	417	57
Series G convertible preferred stock	9
Net income available to common shareholders plus assumed conversions	337	130	417	57
Less: Income allocated to participating securities	2	1	3
Net income allocated to common shareholders plus assumed conversions	$ 335	$ 129	$ 414	$ 57
Earnings per share:
Net income allocated to common shareholders	915	791	898	791
Effect of dilutive securities:
Stock-based awards	4	5	6	5
Series G convertible preferred stock	36
Warrant related to Series F preferred stock		6	4	4
Net income allocated to common shareholders plus assumed conversions	955	802	908	800
Earnings per share:
Net income allocated to common shareholders	$ 0.36	$ 0.16	$ 0.46	$ 0.07
Effect of dilutive securities:
Stock-based awards
Series G convertible preferred stock	$ (0.01)
Warrant related to Series F preferred stock
Net income allocated to common shareholders plus assumed conversions	$ 0.35	$ 0.16	$ 0.46	$ 0.07