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Debt - Convertible Debt (Details) - Convertible Debt
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
d
$ / shares
shares
Jun. 30, 2021
USD ($)
Zero Percent Convertible Senior Notes Due 2026      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   0.00%  
Proceeds from Convertible Debt | $   $ 2,267,000,000  
Amortization of Debt Issuance Costs | $ $ 2,000,000   $ 2,000,000
Debt Instrument, Interest Rate, Effective Percentage 0.30%   0.30%
Convertible Debt, Fair Value Disclosures | $ $ 2,500,000,000   $ 2,500,000,000
Debt Instrument, Convertible, Threshold Consecutive Trading Days | d   30  
Debt Instrument, Convertible, Threshold Trading Days | d   20  
Debt Conversion, Converted Instrument, Amount | $   $ 1,000  
Debt Conversion, Converted Instrument, Shares Issued | shares   57,188,600  
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 17.49  
Debt Instrument, Face Amount | $   $ 2,300,000,000  
Debt Instrument, Redemption Price, Percentage   100.00%  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%  
Zero Percent Convertible Senior Notes Due 2026 | Debt Conversion Terms, One      
Debt Instrument [Line Items]      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | d   30  
Debt Instrument, Convertible, Threshold Trading Days | d   20  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%  
Zero Percent Convertible Senior Notes Due 2026 | Debt Conversion Terms, Two      
Debt Instrument [Line Items]      
Debt Instrument, Convertible, Threshold Consecutive Trading Days | d   5  
Debt Instrument, Convertible, Threshold Trading Days | d   5  
Debt Instrument, Convertible, Threshold Percent Of Conversion Price Triggering Convertible Feature   98.00%  
Zero Percent Convertible Senior Notes Due 2026 Over Allotment Option      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount | $   $ 300,000,000