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REVENUE RECOGNITION - Variable Consideration Provisions (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | $ 1,813 | $ 2,050
Current period provisions | 1,300 | 1,337
Payments and credits | (1,222) | (1,392)
Reserve ending balance | 1,891 | 1,995
Discounts and Allowances |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 190 | 182
Current period provisions | 147 | 156
Payments and credits | (160) | (167)
Reserve ending balance | 177 | 171
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 575 | 691
Current period provisions | 34 | 42
Payments and credits | (56) | (75)
Reserve ending balance | 553 | 658
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 779 | 927
Current period provisions | 602 | 602
Payments and credits | (457) | (588)
Reserve ending balance | 924 | 941
Chargebacks |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 184 | 168
Current period provisions | 462 | 484
Payments and credits | (483) | (501)
Reserve ending balance | 163 | 151
Distribution Fees |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 85 | 82
Current period provisions | 55 | 53
Payments and credits | (66) | (61)
Reserve ending balance | $ 74 | $ 74

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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