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REVENUE RECOGNITION - Variable Consideration Provisions (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | $ 1,813 | $ 2,050
Current period provisions | 2,713 | 2,377
Payments and credits | (2,546) | (2,586)
Reserve ending balance | 1,980 | 1,841
Discounts and Allowances |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 190 | 182
Current period provisions | 306 | 293
Payments and credits | (296) | (316)
Reserve ending balance | 200 | 159
Returns |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 575 | 691
Current period provisions | 77 | 54
Payments and credits | (119) | (124)
Reserve ending balance | 533 | 621
Rebates |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 779 | 927
Current period provisions | 1,227 | 1,018
Payments and credits | (1,025) | (1,096)
Reserve ending balance | 981 | 849
Chargebacks |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 184 | 168
Current period provisions | 993 | 917
Payments and credits | (1,012) | (939)
Reserve ending balance | 165 | 146
Distribution Fees |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Reserve beginning balance | 85 | 82
Current period provisions | 110 | 95
Payments and credits | (94) | (111)
Reserve ending balance | $ 101 | $ 66

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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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