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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cooperative advertising credits included in rebates | $ 1,813 |  |  |  | $ 2,050 |  |  |  | $ 1,813 | $ 2,050 | $ 2,384
Settlement period for cash discounts and allowances |  |  |  |  |  |  |  |  | 1 month |  |
1% change in estimated return rates, Impact on pre-tax earnings |  |  |  |  |  |  |  |  | $ 76 |  |
Sales return provisions |  |  |  |  |  |  |  |  | 5,036 | 5,287 |
1% change in volume of product sold through to Medicaid plan participants, Impact on pre-tax earnings |  |  |  |  |  |  |  |  | 76 |  |
Price appreciation credits | 2,213 | $ 2,138 | $ 1,664 | $ 2,012 | 2,224 | $ 2,209 | $ 2,152 | $ 2,016 | 8,027 | 8,601 | 8,380
Price Appreciation Credit |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price appreciation credits |  |  |  |  |  |  |  |  | $ 15 | 11 |
Minimum |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment terms |  |  |  |  |  |  |  |  | 30 days |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment terms |  |  |  |  |  |  |  |  | 90 days |  |
Rebates, Advertising Credits Portion |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cooperative advertising credits included in rebates | 32 |  |  |  | 29 |  |  |  | $ 32 | 29 |
Returns |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cooperative advertising credits included in rebates | $ 575 |  |  |  | $ 691 |  |  |  | 575 | 691 | $ 813
Sales return provisions |  |  |  |  |  |  |  |  | 120 | 113 |
Reduction in variable consideration provision, adjustment |  |  |  |  |  |  |  |  | $ 38 | $ 80 |

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