SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Variable Consideration Provisions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 2,546
Current period provision	5,887
Payments and credits	(6,049)
Balance at End of Year	2,384
Discounts and Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	167
Current period provision	865
Payments and credits	(857)
Balance at End of Year	175
Returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	863
Current period provision	293
Payments and credits	(343)
Balance at End of Year	813
Rebates
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,094
Current period provision	2,551
Payments and credits	(2,621)
Balance at End of Year	1,024
Chargebacks
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	274
Current period provision	1,966
Payments and credits	(2,031)
Balance at End of Year	209
Distribution Fees
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	148
Current period provision	212
Payments and credits	(197)
Balance at End of Year	$ 163