ALLIANCES (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Alliance Statement [Line Items]
Total Revenues		$ 10,129	$ 6,273	$ 20,910	$ 12,193
Cost of products sold	[1]	2,699	1,972	6,361	3,796
Other (income)/expense, net		(736)	100	427	(161)
Receivables - from alliance partners		7,855		7,855		$ 7,685
Accounts payable - to alliance partners		2,852		2,852		2,445
Collaborative Arrangement [Member]
Alliance Statement [Line Items]
Total Revenues		2,364	2,716	5,192	5,223
Cost of products sold		1,050	1,080	2,356	2,099
Selling, General and Administrative Expense		(38)	(32)	(78)	(60)
Research and Development Expense		233	7	279	21
Other (income)/expense, net		(16)	(16)	(31)	(30)
Receivables - from alliance partners		354		354		347
Accounts payable - to alliance partners		1,039		1,039		1,026
Deferred income from alliance		411		411		$ 431
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement [Member] | bluebird [Member]
Alliance Statement [Line Items]
Milestones and royalties buyout		200
Net product sales [Member]
Alliance Statement [Line Items]
Total Revenues		9,817	6,031	20,358	11,744
Net product sales [Member] | Collaborative Arrangement [Member]
Alliance Statement [Line Items]
Total Revenues		2,201	2,570	4,924	4,948
Collaborative Arrangement [Member] | Collaborative Arrangement [Member]
Alliance Statement [Line Items]
Total Revenues		$ 163	$ 146	$ 268	$ 275

[1] Excludes amortization of acquired intangible assets