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DEBT - Difference Between Fair Value and Unpaid Principal Balance (Details) - Convertible Debt - 2021 Convertible Notes - USD ($)
1 Months Ended 9 Months Ended
Jul. 31, 2021
Sep. 30, 2021
Jul. 23, 2021
Debt Instrument [Line Items]      
Fair value (carrying amount)   $ 2,958,000,000 $ 2,500,000,000
Proceeds received upon issuance   $ 2,500,000,000  
Loss on excess of fair value over unpaid principal $ 458,000,000