ALLIANCES (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Alliance Statement [Line Items]
Total Revenues		$ 10,540		$ 6,007	$ 31,450	$ 18,200
Cost of products sold	[1]	2,502		1,790	8,863	5,586
Other (income)/expense, net		(915)		410	(488)	249
Receivables - from alliance partners		8,062			8,062		$ 7,685
Accounts payable - to alliance partners		2,441			2,441		2,445
Collaborative Arrangement [Member]
Alliance Statement [Line Items]
Total Revenues		2,300		2,607	7,492	7,830
Cost of products sold		1,007		1,017	3,363	3,116
Selling, General and Administrative Expense		(25)		(33)	(103)	(93)
Research and Development Expense		48		11	327	32
Other (income)/expense, net		(28)		(15)	(59)	(45)
Receivables - from alliance partners		336			336		347
Accounts payable - to alliance partners		971			971		1,026
Deferred income from alliance		392			392		$ 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		10,197		5,768	30,555	17,512
Net product sales [Member] | Collaborative Arrangement [Member]
Alliance Statement [Line Items]
Total Revenues		2,116		2,464	7,040	7,412
Collaborative Arrangement [Member] | Collaborative Arrangement [Member]
Alliance Statement [Line Items]
Total Revenues		$ 184		$ 143	$ 452	$ 418

[1] Excludes amortization of acquired intangible assets