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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cooperative advertising credits included in rebates | $ 2,050 |  |  |  | $ 2,384 |  |  |  | $ 2,050 | $ 2,384 | $ 2,546
Settlement period for cash discounts and allowances |  |  |  |  |  |  |  |  | 1 month |  |
1% change in estimated return rates, Impact on pre-tax earnings |  |  |  |  |  |  |  |  | $ 84 |  |
Net improvement in provision |  |  |  |  |  |  |  |  | 180 | 180 |
Reduction in variable consideration provision, adjustment |  | $ 80 |  |  |  | $ 30 |  |  |  |  |
1% change in volume of product sold through to Medicaid plan participants, Impact on pre-tax earnings |  |  |  |  |  |  |  |  | 83 |  |
Price appreciation credits | 2,224 | $ 2,209 | $ 2,152 | $ 2,016 | 2,121 | $ 2,136 | $ 2,128 | $ 1,995 | 8,601 | 8,380 | $ 8,724
Price Appreciation Credit |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price appreciation credits |  |  |  |  |  |  |  |  | $ 11 | 31 |
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 | $ 29 |  |  |  | $ 26 |  |  |  | $ 29 | $ 26 |

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