SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Cooperative advertising credits included in rebates	$ 2,050				$ 2,384				$ 2,050	$ 2,384	$ 2,546
Settlement period for cash discounts and allowances									1 month
1% change in estimated return rates, Impact on pre-tax earnings									$ 84
Net improvement in provision									180	180
Reduction in variable consideration provision, adjustment		$ 80				$ 30
1% change in volume of product sold through to Medicaid plan participants, Impact on pre-tax earnings									83
Price appreciation credits	2,224	$ 2,209	$ 2,152	$ 2,016	2,121	$ 2,136	$ 2,128	$ 1,995	8,601	8,380	$ 8,724
Price Appreciation Credit
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Price appreciation credits									$ 11	31
Minimum
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Payment terms									30 days
Maximum
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Payment terms									90 days
Rebates, Advertising Credits Portion
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Cooperative advertising credits included in rebates	$ 29				$ 26				$ 29	$ 26