PROPOSED CELGENE ACQUISITION PROPOSED CELGENE ACQUISITION (Notes)	3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	PLANNED CELGENE ACQUISITION On January 3, 2019, the Company announced that it has entered into a definitive merger agreement under which it will acquire Celgene. Under the terms of the agreement, which has been approved by the Board of Directors of the Company and Celgene, if the merger is completed, Celgene shareholders will receive one share of the Company common stock and $50.00 in cash for each share of Celgene common stock held by them. Celgene shareholders will also receive one tradeable contingent value right for each share of Celgene representing the right to receive $9.00 in cash, which is subject to the achievement of future regulatory milestones. Based on the closing price of a share of the Company common stock on January 2, 2019, the most recent trading day prior to the date of the announcement, the merger consideration represented approximately $74 billion. The amount of consideration to be received by Celgene shareholders will fluctuate with changes in the price of the shares of the Company common stock. On April 17, 2019, the Company commenced an exchange offer for any and all outstanding notes issued by Celgene for up to $19.85 billion aggregate principal amount of new notes to be issued by the Company and cash, which is conditioned upon the closing of the pending acquisition of Celgene. The Company expects to fund the approximately $36 billion that the Company anticipates will be required to pay the aggregate cash portion of the merger consideration to Celgene shareholders through a combination of cash on hand and, subject to market conditions, short-term borrowings and long-term debt. The Company expects to enter into an accelerated share repurchase program of approximately $5.0 billion, which is subject to Board of Directors’ approval. The ultimate amount of shares to be repurchased may change based on company and market factors. See "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations—Financial Position, Liquidity and Capital Resources" for a discussion of the Company's financing arrangements in connection with the planned acquisition. The acquisition was approved by the Company’s and Celgene’s shareholders on April 12, 2019, but the consummation of the planned acquisition remains subject to the satisfaction of customary closing conditions and regulatory approvals, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”), and approvals under the antitrust laws of other jurisdictions. With respect to the review of the planned acquisition pursuant to the HSR Act, the Company and Celgene on March 25, 2019 each received a request for additional information and documentary materials (also known as a "second request") from the U.S. Federal Trade Commission in connection with its review. The Company expects the planned acquisition will close in the third quarter of 2019.

PLANNED CELGENE ACQUISITION

On January 3, 2019, the Company announced that it has entered into a definitive merger agreement under which it will acquire Celgene. Under the terms of the agreement, which has been approved by the Board of Directors of the Company and Celgene, if the merger is completed, Celgene shareholders will receive one share of the Company common stock and $50.00 in cash for each share of Celgene common stock held by them. Celgene shareholders will also receive one tradeable contingent value right for each share of Celgene representing the right to receive $9.00 in cash, which is subject to the achievement of future regulatory milestones. Based on the closing price of a share of the Company common stock on January 2, 2019, the most recent trading day prior to the date of the announcement, the merger consideration represented approximately $74 billion. The amount of consideration to be received by Celgene shareholders will fluctuate with changes in the price of the shares of the Company common stock.

On April 17, 2019, the Company commenced an exchange offer for any and all outstanding notes issued by Celgene for up to $19.85 billion aggregate principal amount of new notes to be issued by the Company and cash, which is conditioned upon the closing of the pending acquisition of Celgene. The Company expects to fund the approximately $36 billion that the Company anticipates will be required to pay the aggregate cash portion of the merger consideration to Celgene shareholders through a combination of cash on hand and, subject to market conditions, short-term borrowings and long-term debt. The Company expects to enter into an accelerated share repurchase program of approximately $5.0 billion, which is subject to Board of Directors’ approval. The ultimate amount of shares to be repurchased may change based on company and market factors. See "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations—Financial Position, Liquidity and Capital Resources" for a discussion of the Company's financing arrangements in connection with the planned acquisition.

The acquisition was approved by the Company’s and Celgene’s shareholders on April 12, 2019, but the consummation of the planned acquisition remains subject to the satisfaction of customary closing conditions and regulatory approvals, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”), and approvals under the antitrust laws of other jurisdictions. With respect to the review of the planned acquisition pursuant to the HSR Act, the Company and Celgene on March 25, 2019 each received a request for additional information and documentary materials (also known as a "second request") from the U.S. Federal Trade Commission in connection with its review. The Company expects the planned acquisition will close in the third quarter of 2019.