Earnings Per Share (Calculation of Our Basic and Diluted EPS) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 494		$ 479
Average shares of common stock outstanding - Basic	570.5		579.8
Net effect of potentially dilutive securities	1.4	[1]	0.7	[1]
Average shares of common stock outstanding - Diluted	571.9		580.5
Earnings Per Common Share - Basic	$ 0.87		$ 0.83
Earnings Per Common Share - Diluted	$ 0.86		$ 0.82

[1] Potentially dilutive securities consist of options, goal-based stock and contingently convertible senior notes.