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Acquisitions and Other Arrangements - Summary of Fair Value of Assets Acquired (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 16, 2018
Dec. 31, 2017
Assets acquired      
Goodwill $ 3,107   $ 3,099
Mallinckrodt plc | RECOTHROM and PREVELEAK      
Assets acquired      
Accounts receivable   $ 2  
Inventories   39  
Goodwill   13  
Other intangible assets   108  
Total assets acquired   $ 162