Shareholders Equity (Details) (USD $) In Millions, except Share data	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash dividends declared per common share	$ 0.01	$ 0.01
Common stock repurchased under employee stock plans				28,000,000
Reserve of unissued common shares	1,500,000,000			1,500,000,000
Issued restricted stock units				196,000,000
Authorized restricted stock units be settled in common shares	129,000,000			129,000,000
Preferred Stock Summary (Textuals) [Abstract]
Preferred stock dividends	$ 301	$ 310	$ 340	$ 611	$ 688
Common Stock and Additional Paid-in Capital [Member]
Common stock issued under employee plans				48,035,000	96,773,000