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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Effective tax rate (as a percent) 19.00% 23.00% 22.00% 24.00%
Statutory tax rate (as a percent)     35.00%  
Reasonably possible amount that gross unrecognized tax benefits may change within the next twelve months, high end of range $ 22   $ 22  
Pharmacyclics Inc | State        
Valuation allowances $ 103   $ 103