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	1,043				1,043
Other comprehensive income (loss)	(883)					(883)
Accretion of issuance costs	0	1			(1)
Cash dividends declared:
Common stock	(235)
Preferred stock	(13)				(13)
Common stock acquired	(920)						(920)
Common stock acquired (shares)							15,068,000
Common stock awards and options exercised, including related taxes	220			46			174
Common stock awards and options exercised, including related taxes (shares)			(9,000)				(4,807,000)
Other	0
Other (shares)							(3,000)
Ending balance at Jun. 30, 2013	20,081	490	504	9,713	12,545	(523)	(2,648)
Ending balance (shares) at Jun. 30, 2013			503,891,000				55,496,000
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	985				985
Other comprehensive income (loss)	584					584
Preferred stock issued	742	742
Cash dividends declared:
Common stock	(240)
Preferred stock	(25)				(25)
Common stock acquired	(830)						(830)
Common stock acquired (shares)	12,400,000						12,380,000
Common stock awards and options exercised, including related taxes	107			(11)			118
Common stock awards and options exercised, including related taxes (shares)			(2,000)				(3,221,000)
Other	(1)				(1)
Other (shares)							(3,000)
Ending balance at Jun. 30, 2014	$ 21,700	$ 1,233	$ 504	$ 9,765	$ 14,114	$ 489	$ (4,405)
Ending balance (shares) at Jun. 30, 2014			503,881,000				78,910,000