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REVENUE RECOGNITION - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jan. 01, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Sales return provisions |  |  | $ 4,062,000,000 | $ 3,697,000,000 |  |  |  |
Cooperative advertising credits included in rebates | $ 1,951,000,000 | $ 1,902,000,000 | 1,951,000,000 | 1,902,000,000 |  | $ 1,813,000,000 |  | $ 2,050,000,000
Price appreciation credits | 2,111,000,000 | 2,138,000,000 | 6,238,000,000 | 5,814,000,000 |  |  |  |
Price Appreciation Credit |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Price appreciation credits |  |  | 1,000,000 | 4,000,000 |  |  |  |
Returns |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Sales return provisions |  |  | 94,000,000 | 71,000,000 |  |  |  |
Reduction in variable consideration provision, adjustment | 28,000,000 | 38,000,000 |  |  |  |  |  |
Cooperative advertising credits included in rebates | 502,000,000 | 577,000,000 | 502,000,000 | 577,000,000 |  | $ 575,000,000 |  | $ 691,000,000
Rebates, Advertising Credits Portion |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |
Cooperative advertising credits included in rebates | $ 38,000,000 | $ 33,000,000 | $ 38,000,000 | $ 33,000,000 | $ 32,000,000 |  | $ 29,000,000 |

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