CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Unaudited - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Table]
Net income (loss)	$ 381	$ 340	$ 1,050	$ 1,098
Other Comprehensive Income (Loss), Net of Tax
Unrealized holding gains (losses) on available-for-sale securities arising during period	208	(69)	64	233
Reclassification adjustment for net (gains) losses included in net income	(7)	(3)	(11)	(16)
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period	42	(3)	71	19
Reclassification adjustment for net gains on cash flow hedge derivatives included in net income	(13)	(7)	(36)	(20)
Net actuarial gain (loss) arising during the year	(1)		(3)
Reclassification of amounts to net periodic benefit costs	2	1	8	3
Other comprehensive income (loss)	231	(81)	93	219
Comprehensive income	612	259	1,143	1,317
Comprehensive income attributable to noncontrolling interests			(6)	2
Comprehensive income attributable to Bancorp	$ 612	$ 259	$ 1,149	$ 1,315