Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share, Basic, Two Class Method [Abstract]
Net income	$ 17,923	$ 21,284	$ 18,976
Less: Preferred stock dividends	805	653	629
Net income applicable to common equity	17,118	20,631	18,347
Less: Dividends and undistributed earnings allocated to participating securities	525	754	779
Net income applicable to common stockholders	16,593	19,877	17,568
Total weighted-average basic shares outstanding	3,782.4	3,809.4	3,900.4
Net income per share	$ 4.39	$ 5.22	$ 4.50
Earnings Per Share, Diluted, Two Class Method [Abstract]
Net income applicable to common stockholders	$ 16,593	$ 19,877	$ 17,568
Total weighted-average basic shares outstanding	3,782.4	3,809.4	3,900.4
Add: Employee stock options, SARs and warrants	32.5	12.8	19.9
Total weighted-average diluted shares outstanding	3,814.9	3,822.2	3,920.3
Net income per share	$ 4.35	$ 5.20	$ 4.48
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	6	148	133