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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Variable Consideration Provisions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | $ 1,813 | $ 2,050
Current period provision | 5,428 | 5,036
Payments and credits | (5,378) | (5,273)
Balance, end of year | 1,863 | 1,813
Discounts and Allowances |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 190 | 182
Current period provision | 625 | 621
Payments and credits | (593) | (613)
Balance, end of year | 222 | 190
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 575 | 691
Current period provision | 131 | 120
Payments and credits | (224) | (236)
Balance, end of year | 482 | 575
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 779 | 927
Current period provision | 2,462 | 2,174
Payments and credits | (2,297) | (2,322)
Balance, end of year | 944 | 779
Chargebacks |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 184 | 168
Current period provision | 1,999 | 1,925
Payments and credits | (2,013) | (1,909)
Balance, end of year | 170 | 184
Distribution Fees |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Balance, beginning of year | 85 | 82
Current period provision | 211 | 196
Payments and credits | (251) | (193)
Balance, end of year | $ 45 | $ 85

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