INCOME TAXES INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Valuation Allowance [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 729	$ 849	$ 94
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations, Including Interest Accrued	81	119
Asset acquisition charges	1,099	63	1,211
Deferred Tax Assets, Valuation Allowance	2,809	2,844
Income tax payments	3,400	1,500	$ 747
MyoKardia Acquisition [Member]
Valuation Allowance [Line Items]
Asset acquisition charges	11,400
Foreign Net Operating Loss And Tax Credit Carryforwards [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	2,000
State Net Operating Loss And Tax Credit Carryforwards [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	207
SEC Schedule, 12-09, Valuation Allowance, Other Tax Carryforward [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	557
Domestic Tax Authority [Member]
Valuation Allowance [Line Items]
Operating Loss Carryforwards	1,500
Minimum [Member]
Valuation Allowance [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	375
Maximum [Member]
Valuation Allowance [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	415
Otezla [Member]
Valuation Allowance [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 266	$ 808