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Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Net income attributable to Biogen Idec Inc $ 856,858 $ 487,616 $ 2,051,320 $ 1,405,035
Denominator:        
Weighted average number of common shares outstanding 236,217,000 237,070,000 236,641,000 237,131,000
Effect of dilutive securities:        
Dilutive potential common shares 800,000 1,200,000 800,000 1,400,000
Shares used in calculating diluted earnings per share 236,972,000 238,349,000 237,449,000 238,508,000
Stock options and employee stock purchase plan
        
Effect of dilutive securities:        
Stock units 100,000 200,000 100,000 400,000
Time-vested restricted stock units
        
Effect of dilutive securities:        
Stock units 500,000 700,000 500,000 700,000
Market stock units
        
Effect of dilutive securities:        
Stock units 200,000 300,000 200,000 300,000