v2.4.0.6
Deferred Compensation Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred Compensation Plans [Abstract]      
Percentage of employees contribution to eligible annual compensation 60.00%    
Percentage of employers contribution 50.00% 50.00% 50.00%
Amount of annual maximum match $ 5,000 $ 5,000 $ 5,000
Percentage of officers and other senior grade level employees 70.00%    
Percentage of officers and other senior grade level employees on annual bonus 100.00%    
Percentage of contribution by directors on annual retainer fee 100.00%    
Total matching contribution expense under Gilead plan $ 18,800,000 $ 11,200,000 $ 10,200,000
Phantom shares outstanding 35,376    
Percentage of restricted stock units award deferred to directors 100.00%