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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
May 19, 2017
Feb. 06, 2017
Feb. 02, 2017
May 19, 2017
Oct. 01, 2017
Share Repurchase Agreement with Citibank [Member]          
Accelerated Share Repurchases [Line Items]          
Share repurchase agreement, amount     $ 5,000,000,000    
Accelerated share repurchases, cash paid   $ 5,000,000,000      
Shares repurchased 24 126      
Shares repurchased, price per share (in dollars per share)   $ 31.73      
Shares received in initial delivery, percentage of agreement amount     80.00%    
Average price paid for shares delivered under agreement (in dollars per share)       $ 33.31  
Remaining authorized repurchase amount         $ 6,400,000,000
Pro Forma [Member] | Mylotarg [Member]          
Accelerated Share Repurchases [Line Items]          
Research arrangement, fixed payment obligation         $ 310,000,000
Term over which additional fixed payments are to be made         10 years