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REVENUE RECOGNITION - Variable Consideration Provisions (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | $ 1,813 | $ 2,050
Current period provisions | 4,062 | 3,697
Payments and credits | (3,924) | (3,845)
Reserve ending balance | 1,951 | 1,902
Discounts and Allowances |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 190 | 182
Current period provisions | 472 | 457
Payments and credits | (448) | (454)
Reserve ending balance | 214 | 185
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 575 | 691
Current period provisions | 94 | 71
Payments and credits | (167) | (185)
Reserve ending balance | 502 | 577
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 779 | 927
Current period provisions | 1,842 | 1,587
Payments and credits | (1,619) | (1,605)
Reserve ending balance | 1,002 | 909
Chargebacks |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 184 | 168
Current period provisions | 1,487 | 1,433
Payments and credits | (1,524) | (1,451)
Reserve ending balance | 147 | 150
Distribution Fees |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 85 | 82
Current period provisions | 167 | 149
Payments and credits | (166) | (150)
Reserve ending balance | $ 86 | $ 81

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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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