EPS (Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings per share:
Net income (loss) attributable to Bancorp	$ 516	$ 381	$ 1,175	$ 1,056
Dividends on preferred stock	15	15	52	52
Net income (loss) available to common shareholders	501	366	1,123	1,004
Less: Income allocated to participating securities	5	4	11	10
Earnings per share - basic	496	362	1,112	994
Earnings per diluted share:
Net income available to common shareholders	501	366	1,123	1,004
Stock-based awards	0	0	0	0
Net income available to common shareholders plus assumed conversions	501	366	1,123	1,004
Less: Income allocated to participating securities	5	4	11	10
Net income allocated to common shareholders	$ 496	$ 362	$ 1,112	$ 994
Earnings per share:
Net income allocated to common shareholders	750,885,834	795,792,825	761,147,543	803,269,681
Effect of dilutive securities:
Stock-based awards	6,000,000	9,000,000	6,000,000	9,000,000
Net income allocated to common shareholders	757,455,625	805,022,588	766,941,312	812,099,365
Earnings per share:
Earnings per share - basic	$ 0.66	$ 0.46	$ 1.46	$ 1.24
Earnings per diluted share:
Earnings per share - diluted	$ 0.65	$ 0.45	$ 1.45	$ 1.22