Consolidated Statement of Changes In Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	PREFERRED STOCK	COMMON STOCK	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	TREASURY STOCK
Beginning balance at Dec. 31, 2012	$ 20,869	$ 489	$ 504	$ 9,667	$ 11,751	$ 360	$ (1,902)
Beginning balance (shares) at Dec. 31, 2012			503,900,000				45,238,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,583				1,583
Other comprehensive income (loss)	(474)					(474)
Accretion of issuance costs	0	(1)			(1)
Cash dividends declared:
Common stock	(350)
Preferred stock	(20)				(20)
Common stock acquired	(1,480)						(1,480)
Common stock acquired (shares)							23,235,000
Common stock awards and options exercised, including related taxes	302			86			216
Common stock awards and options exercised, including related taxes (shares)			(15,000)				(5,874,000)
Other	0
Other (shares)							(12,000)
Ending balance at Sep. 30, 2013	20,430	490	504	9,753	12,963	(114)	(3,166)
Ending balance (shares) at Sep. 30, 2013			503,885,000				62,587,000
Beginning balance at Dec. 31, 2013	20,378	491	504	9,776	13,395	(95)	(3,693)
Beginning balance (shares) at Dec. 31, 2013			503,883,000				69,754,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,545				1,545
Other comprehensive income (loss)	(12)					(12)
Preferred stock issued	742	742
Cash dividends declared:
Common stock	(366)
Preferred stock	(43)				(43)
Common stock acquired	(1,240)						(1,240)
Common stock acquired (shares)	18,200,000						18,187,000
Common stock awards and options exercised, including related taxes	152			4			148
Common stock awards and options exercised, including related taxes (shares)			(3,000)				(3,984,000)
Other	0
Other (shares)							(8,000)
Ending balance at Sep. 30, 2014	$ 21,156	$ 1,233	$ 504	$ 9,780	$ 14,531	$ (107)	$ (4,785)
Ending balance (shares) at Sep. 30, 2014			503,880,000				83,949,000