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	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings per share:
Net income (loss) attributable to Bancorp	$ 1,564	$ 1,712	$ 1,481
Dividends on preferred stock	75	75	67
Net income (loss) available to common shareholders	1,489	1,637	1,414
Less: Income allocated to participating securities	15	15	12
Net income allocated to common shareholders	1,474	1,622	1,402
Earnings per diluted share:
Net income available to common shareholders	1,489	1,637	1,414
Stock-based awards	0	0	0
Net income available to common shareholders plus assumed conversions	1,489	1,637	1,414
Less: Income allocated to participating securities	15	15	12
Net income allocated to common shareholders plus assumed conversions	$ 1,474	$ 1,622	$ 1,402
Earnings per share:
Net income allocated to common shareholders	757,432,291	798,628,173	833,116,349
Effect of dilutive securities:
Stock-based awards	7,000,000	9,000,000	10,000,000
Net income allocated to common shareholders	764,495,353	807,658,669	842,967,356
Earnings per share:
Net income allocated to common shareholders	$ 1.95	$ 2.03	$ 1.68
Earnings per diluted share:
Net income allocated to common shareholders plus assumed conversions	$ 1.93	$ 2.01	$ 1.66