Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
OCI Statement [Abstract]
Net Income	$ 478	$ 576	$ 1,056	$ 832
OCI, Net of Tax
Change in unrecognized pension and postretirement costs	2	12	3	26
Change in unrealized net gains (losses) on cash flow hedges	(2)	155	9	162
Change in unrealized net gains (losses) on AFS securities	86	(354)	165	(415)
Change in FDIC's share of unrealized gains (losses) on AFS securities	3	17	9	4
Other, net	5	(2)	1	(2)
Total OCI	94	(172)	187	(225)
Total Comprehensive Income	572	404	1,243	607
Tax Effect Of Items Included In OCI [Abstract]
Change in unrecognized pension and postretirement costs	1	8	2	17
Change in unrealized net gains (losses) on cash flow hedges	(1)	95	6	98
Change in unrealized net gains (losses) on AFS securities	53	(215)	98	(252)
Change in FDIC's share of unrealized gains (losses) on AFS securities	1	10	4	1
Other, net	$ 2	$ 1	$ 1	$ 1