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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

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- Definition The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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