Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
OCI Statement [Abstract]
Net Income	$ 561	$ 309	$ 1,617	$ 1,141
OCI, Net of Tax
Change in unrecognized pension and postretirement costs	(17)	1	(14)	27
Change in unrealized net gains (losses) on cash flow hedges	9	3	18	165
Change in unrealized net gains (losses) on AFS securities	(36)	(95)	129	(510)
Change in FDIC's share of unrealized gains (losses) on AFS securities	9	13	18	17
Other, net	(1)	2	0	0
Total OCI	(36)	(76)	151	(301)
Total Comprehensive Income	525	233	1,768	840
Tax Effect Of Items Included In OCI [Abstract]
Change in unrecognized pension and postretirement costs	(10)	4	(8)	21
Change in unrealized net gains (losses) on cash flow hedges	4	2	10	100
Change in unrealized net gains (losses) on AFS securities	(19)	(54)	79	(306)
Change in FDIC's share of unrealized gains (losses) on AFS securities	6	8	10	9
Other, net	$ 0	$ 0	$ 1	$ 1