CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income
Net income (loss)	$ 2,194	$ 1,560	$ 1,706
Other Comprehensive Income (Loss), Net of Tax
Unrealized holding gains (losses) on available-for-sale securities arising during the year	21	(130)	(227)
Reclassification adjustment for net (gains) losses included in net income	4	(7)	(10)
Unrealized holding gains (losses) on cash flow hedge derivatives arising during the year	(7)	19	48
Reclassification adjustment for net gains on cash flow hedge derivatives included in net income	(12)	(31)	(49)
Net actuarial gain (loss) arising during the year	1	(1)	(5)
Reclassification of amounts to net periodic benefit costs	7	12	11
Other comprehensive income (loss), Net of Tax	14	(138)	(232)
Comprehensive income	2,208	1,422	1,474
Comprehensive income attributable to noncontrolling interests	0	(4)	(6)
Comprehensive income attributable to Bancorp	$ 2,208	$ 1,426	$ 1,480