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OTHER FINANCIAL INFORMATION - Accrued and Other Current Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Other Financial Information [Abstract] |  |
Compensation and employee benefits | $ 691 | $ 864
Income taxes payable | 447 | 598
Allowance for sales returns | 530 | 587
Other accrued liabilities | 2,113 | 2,287
Total | $ 3,781 | $ 4,336

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