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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings per share:
Net income attributable to Bancorp	$ 333	$ 315	$ 660	$ 676
Dividends on preferred stock	23	23	38	38
Net income (loss) available to common shareholders	310	292	622	638
Less: Income allocated to participating securities	3	3	6	6
Earnings per share - basic	307	289	616	632
Earnings per diluted share:
Net income available to common shareholders	310	292	622	638
Net income available to common shareholders plus assumed conversions	310	292	622	638
Less: Income allocated to participating securities	3	3	6	6
Net income allocated to common shareholders	$ 307	$ 289	$ 616	$ 632
Earnings per share:
Net income allocated to common shareholders	759,105,385	803,965,057	766,334,781	807,070,071
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	765,080,097	812,842,540	771,736,275	815,741,295
Earnings per share:
Earnings per share - basic	$ 0.4	$ 0.36	$ 0.8	$ 0.78
Earnings per diluted share:
Earnings per share - diluted	$ 0.4	$ 0.36	$ 0.8	$ 0.77