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Subsequent Events (Details) (USD $)
Jul. 19, 2011
Jun. 30, 2011
Dec. 31, 2010
Jul. 19, 2011
Forward Sale Agreements [Member]
Jul. 13, 2011
Forward Sale Agreements [Member]
Jun. 16, 2011
Purchase And Sale Agreement [Member]
Jul. 19, 2011
Floating Rate Senior Notes Due 2014 [Member]
Jul. 19, 2011
2.125% Senior Notes Due 2014 [Member]
Jul. 19, 2011
3.150% Senior Notes Due 2016 [Member]
Jul. 19, 2011
4.750% Senior Notes Due 2021 [Member]
Cash           $ 6,200,000,000        
Common stock issued   507,886,987 504,801,064 40,000,000   55,900,000        
Price per share before discounts and commissions       $ 50.00            
Common stock initial sale price       $ 48.50            
Stock option granted to underwriters, term, days         30          
Amount of cash proceeds in exchange for common stock       1,900,000,000            
Additional common stock to be purchased in thirty day option for underwriters       6,000,000            
Proceeds from senior notes $ 3,000,000,000           $ 250,000,000 $ 750,000,000 $ 750,000,000 $ 1,250,000,000
Interest rate percentage of senior notes               2.125% 3.15% 4.75%