v2.4.0.6
Equity Narrative (Detail) (USD $)
 1 Months Ended 12 Months Ended 78 Months Ended 12 Months Ended
Dec. 12, 2011
Feb. 01, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2009
Wyeth [Member]
Dec. 31, 2011
Employee Stock Ownership Plans [Member]
Stockholders Equity Note [Line Items]              
Common stock, shares issued in connection to the Wyeth acquisition           1,300,000,000  
Amount of shares authorized in stock purchase plan, value $ 10,000,000,000 $ 5,000,000,000          
Total shares repurchased, shares     459,000,000 61,000,000 1,200,000,000    
Total cost of shares repurchased     9,000,000,000 1,000,000,000 28,000,000,000    
Amount of remaining shares authorized in stock purchase plan, value     10,000,000,000        
Series A convertible perpetual preferred stock, dividends rate             6.25%
Preferred ESOP held preferred shares with a stated value             $ 45,000,000
Series A convertible perpetual preferred stock, per share stated value     $ 40,300   $ 40,300    
Series A convertible perpetual preferred stock, common stock shares when converted     2,574.87   2,574.87   3,000,000
Common ESOP, shares held             4,000,000