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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Variable Consideration Provisions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | $ 2,050 | $ 2,384
Acquisition of Synergy |  | 16
Current period provision | 5,036 | 5,287
Payments and credits | (5,273) | (5,637)
Balance, end of year | 1,813 | 2,050
Discounts and Allowances |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 182 | 175
Acquisition of Synergy |  | 0
Current period provision | 621 | 776
Payments and credits | (613) | (769)
Balance, end of year | 190 | 182
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 691 | 813
Acquisition of Synergy |  | 3
Current period provision | 120 | 113
Payments and credits | (236) | (238)
Balance, end of year | 575 | 691
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 927 | 1,024
Acquisition of Synergy |  | 12
Current period provision | 2,174 | 2,265
Payments and credits | (2,322) | (2,374)
Balance, end of year | 779 | 927
Chargebacks |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 168 | 209
Acquisition of Synergy |  | 0
Current period provision | 1,925 | 1,938
Payments and credits | (1,909) | (1,979)
Balance, end of year | 184 | 168
Distribution Fees |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 82 | 163
Acquisition of Synergy |  | 1
Current period provision | 196 | 195
Payments and credits | (193) | (277)
Balance, end of year | $ 85 | $ 82

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