Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Millions	Dec. 31, 2015	May. 26, 2015	Dec. 31, 2014
Inventories, Net
Finished goods	$ 469		$ 341
Work-in-process	1,081		629
Raw materials	169		154
Inventories, net	1,719		1,124
Inventories acquired		$ 492
Accounts Receivable
Allowance for accounts receivable	78		$ 74
Pharmacyclics Inc
Inventories, Net
Inventories acquired	$ 356

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