Consolidated Statement of Changes In Shareholders' Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	PREFERRED STOCK	COMMON STOCK	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	TREASURY STOCK
Beginning balance at Dec. 31, 2010	$ 17,787	$ 0	$ 502	$ 9,356	$ 8,634	$ (689)	$ (16)
Beginning balance (shares) at Dec. 31, 2010			502,064				420
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,920				1,920
Other comprehensive income (loss)	30					30
Preferred stock issued	500	500
Cash dividends declared:
Common stock	(358)				(358)
Preferred stock	(20)				(20)
Common stock acquired	(675)						(675)
Common stock acquired (shares)							16,313
Common stock awards and options exercised, including related taxes	235		2	223			10
Common stock awards and options exercised, including related taxes (shares)			1,902				177
Other	(21)			(22)			1
Other (shares)							(14)
Ending balance at Dec. 31, 2011	19,398	500	504	9,557	10,176	(659)	(680)
Ending balance (shares) at Dec. 31, 2011			503,966				16,542
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,061				2,061
Other comprehensive income (loss)	1,019					1,019
Redemption of preferred stock	(500)	(500)
Preferred stock issued	488	488
Accretion of issuance costs	0	1			(1)
Cash dividends declared:
Common stock	(456)				(456)
Preferred stock	(29)				(29)
Common stock acquired	(1,440)						(1,440)
Common stock acquired (shares)							33,408
Common stock awards and options exercised, including related taxes	327			110			217
Common stock awards and options exercised, including related taxes (shares)	1,459		66				4,693
Other	1						1
Other (shares)							(19)
Ending balance at Dec. 31, 2012	20,869	489	504	9,667	11,751	360	(1,902)
Ending balance (shares) at Dec. 31, 2012			503,900				45,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,136				2,136
Other comprehensive income (loss)	(455)					(455)
Accretion of issuance costs	0	2			(2)
Cash dividends declared:
Common stock	(463)				(463)
Preferred stock	(26)				(26)
Common stock acquired	(2,040)						(2,040)
Common stock acquired (shares)	31,200						31,237
Common stock awards and options exercised, including related taxes	362			113			249
Common stock awards and options exercised, including related taxes (shares)	2,725		17				6,709
Other	(5)			(4)	(1)
Other (shares)							(12)
Ending balance at Dec. 31, 2013	$ 20,378	$ 491	$ 504	$ 9,776	$ 13,395	$ (95)	$ (3,693)
Ending balance (shares) at Dec. 31, 2013			503,883				69,754