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Earnings per Common Share Attributable to Common Shareholders - Basic Numerator (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
EPS Numerator-Basic:      
Income from continuing operations $ 8,739 $ 8,211 $ 8,529
Less: Net income attributable to noncontrolling interests 42 31 8
Income from continuing operations attributable to Pfizer Inc. 8,697 8,180 8,521
Less: Preferred stock dividends-net of tax 2 2 2
Income from continuing operations attributable to Pfizer Inc. common shareholders 8,695 8,178 8,519
Discontinued operations-net of tax 1,312 77 114
Net income attributable to Pfizer Inc. common shareholders $ 10,007 $ 8,255 $ 8,633
EPS Denominator:      
Weighted-average number of common shares outstanding-Basic 7,817 8,036 7,007
Common-share equivalents: stock options, stock issuable under employee compensation plans and convertible preferred stock 53 38 38
Weighted-average number of common shares outstanding-Diluted 7,870 8,074 7,045
Stock options that had exercise prices greater than the average market price of our common stock issuable under employee compensation plans 272 [1] 413 [1] 400 [1]
[1] These common stock equivalents were outstanding during 2011, 2010 and 2009 but were not included in the computation of diluted EPS for those years because their inclusion would have had an anti-dilutive effect.