Consolidated Statement of Changes in Shareholders' Equity (USD $) In Millions, except Share data in Thousands	Preferred Stock [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total
Beginning Balance at Dec. 31, 2009		$ 495	$ 9,180	$ 7,071	$ (2,238)	$ (17)	$ 14,491
Beginning Balance (in shares) at Dec. 31, 2009		495,366				432
Adjustment for effect of application of provisions of new accounting standard				27	(27)
Balance at January 1, 2010 (in shares)		495,366				432
Balance at January 1, 2010		495	9,180	7,098	(2,265)	(17)	14,491
Comprehensive income:
Net income				927			927
Change in net unrealized loss on available-for-sale securities, net of reclassification adjustment and net of related taxes					1,125		1,125
Change in net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes					(53)		(53)
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes					(44)		(44)
Foreign currency translation, net of related taxes					(476)		(476)
Change in net unrealized losses on cash flow hedges, net of related taxes					6		6
Total comprehensive income				927	558		1,485
Cash dividends declared:
Common stock				(10)			(10)
Common stock awards and options exercised, including related taxes (in shares)		6,495
Common stock awards and options exercised, including related taxes		7	86				93
Other (in shares)						2
Balance at Jun. 30, 2010		502	9,266	8,015	(1,707)	(17)	16,059
Balance (in shares) at Jun. 30, 2010		501,861				434
Beginning Balance at Dec. 31, 2010		502	9,356	8,634	(689)	(16)	17,787
Beginning Balance (in shares) at Dec. 31, 2010		502,064				420
Comprehensive income:
Net income				984			984
Change in net unrealized loss on available-for-sale securities, net of reclassification adjustment and net of related taxes					358		358
Change in net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes					8		8
Expected losses from other-than-temporary impairment on held-to-maturity securities related to factors other than credit, net of related taxes					13		13
Foreign currency translation, net of related taxes					472		472
Change in net unrealized losses on cash flow hedges, net of related taxes					3		3
Change in minimum pension liability, net of related taxes					(5)		(5)
Total comprehensive income				984	849		1,833
Preferred stock issued	500						500
Cash dividends declared:
Common stock				(181)			(181)
Preferred stock				(7)			(7)
Common stock acquired						(225)	(225)
Common stock acquired (in shares)						4,872
Common stock awards and options exercised, including related taxes (in shares)		1,988				(127)
Common stock awards and options exercised, including related taxes		2	129			6	137
Other (in shares)						(7)
Other			(11)			1	(10)
Balance at Jun. 30, 2011	$ 500	$ 504	$ 9,474	$ 9,430	$ 160	$ (234)	$ 19,834
Balance (in shares) at Jun. 30, 2011		504,052				5,158