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DEBT - 2021 Convertible Notes (Details) - Convertible Debt - 2021 Convertible Notes
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2021
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jul. 23, 2021
USD ($)
Debt Instrument [Line Items]        
Fair value (carrying amount)   $ 2,958,000,000 $ 2,958,000,000 $ 2,500,000,000
Conversion price (in USD per share) | $ / shares $ 71.03      
Conversion ratio 0.85      
Fair value (carrying amount)   3,049,000,000 3,049,000,000  
Loss on issuance   549,000,000 549,000,000  
Gain on change in fair value     $ (91,000,000)  
Cash interest payments   $ 0    
Minimum        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 0.00%      
Maximum        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 5.00%