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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Variable Consideration Provisions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Year | $ 2,384 | $ 2,546
Acquisition of Synergy | 16 |
Current period provision | 5,287 | 5,887
Payments and credits | (5,637) | (6,049)
Balance at End of Year | 2,050 | 2,384
Discounts and Allowances |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Year | 175 | 167
Acquisition of Synergy | 0 |
Current period provision | 776 | 865
Payments and credits | (769) | (857)
Balance at End of Year | 182 | 175
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Year | 813 | 863
Acquisition of Synergy | 3 |
Current period provision | 113 | 293
Payments and credits | (238) | (343)
Balance at End of Year | 691 | 813
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Year | 1,024 | 1,094
Acquisition of Synergy | 12 |
Current period provision | 2,265 | 2,551
Payments and credits | (2,374) | (2,621)
Balance at End of Year | 927 | 1,024
Chargebacks |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Year | 209 | 274
Acquisition of Synergy | 0 |
Current period provision | 1,938 | 1,966
Payments and credits | (1,979) | (2,031)
Balance at End of Year | 168 | 209
Distribution Fees |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance at Beginning of Year | 163 | 148
Acquisition of Synergy | 1 |
Current period provision | 195 | 212
Payments and credits | (277) | (197)
Balance at End of Year | $ 82 | $ 163

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