Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Antidilutive Options Table [Abstract]
Antidilutive options	3,800,000	4,100,000
Statement Line Items [Line Items]
Shareholders' income from continuing operations	$ 371	$ 413
Earnings Per Share Text Details [Abstract]
Common shares held in Treasury	77,847,260	80,240,471
Earnings Per Share Basic Member
Shares (in thousands):
Weighted average	285,159,000	270,377,000
Total shares	285,159,000	270,377,000
EPS	$ 1.30	$ 1.53
Effect Of Dilution [Member]
Shares (in thousands):
Common stock equivalents	3,840,000	3,496,000
Total shares	3,840,000	3,496,000
EPS	$ (0.02)	$ (0.02)
Earnings Per Share Diluted [Member]
Shares (in thousands):
Weighted average	285,159,000	270,377,000
Common stock equivalents	3,840,000	3,496,000
Total shares	288,999,000	273,873,000
EPS	$ 1.28	$ 1.51