Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings from continuing operations	$ 184	$ 352	$ 573	$ 1,426
Basic earnings per share	$ 0.44	$ 0.79	$ 1.35	$ 3.20
Diluted earnings per share	$ 0.43	$ 0.79	$ 1.34	$ 3.19
Antidilutive securities excluded from computation of earnings per share, amount	3.1	7.9	3.1	6.4
Earnings [Member]
Earnings from continuing operations	184	352	573	1,426
Attributable to participating securities	(2)	(4)	(6)	(17)
Basic earnings per share	182	348	567	1,409
Diluted earnings per share	$ 182	$ 348	$ 567	$ 1,409
Common Stock [Member]
Earnings from continuing operations, in shares	422	445	425	446
Attributable to participating securities, in shares	(5)	(5)	(5)	(5)
Basic earnings per share, shares	417	440	420	441
Dilutive effect of potential common shares issuable upon the exercise of outstanding stock options, in shares	2	1	2	1
Diluted earnings per share, shares	419	441	422	442
Earnings per Share [Member]
Basic earnings per share	$ 0.44	$ 0.79	$ 1.35	$ 3.20
Diluted earnings per share	$ 0.43	$ 0.79	$ 1.34	$ 3.19

Value of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

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