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Consolidated Statements of Stockholders Equity (unaudited) (USD $)
In Millions
Total
Preferred Stock [Member]
Common Stock [Member]
Common Stock Securities Exchangable [Member]
Treasury Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Other Comprehensive Income [Member]
Total Line Item [Member]
Noncontrolling Interest [Member]
Balance at Dec. 31, 2010$ 23,771$ 0$ 770$ 0$ (2,665)$ 6,756$ 19,907$ (997)  
Shares Balance at Dec. 31, 2010  770 (60)     
Shares issued - stock based compensation167   251(84)    
Shares issued - stock based compensation, shares    6     
Shares repurchased(307)   (307)     
Shares repurchased, shares    (12)     
Stock-based compensation(2)    (2)    
Net income2,397     2,397   
Other comprehensive income (loss)82      82  
Dividends paid(462)     (462)   
Purchase of subsidiary shares from noncontrolling interest         8
Distribution related to spin-off of downstream businesses(8,898)    5(9,490)587  
Balance at Sep. 30, 2011$ 16,756$ 0$ 770$ 0$ (2,721)$ 6,675$ 12,352$ (328) $ 8
Shares Balance at Sep. 30, 2011  770 (66)