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Strategic Partnership (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Oct. 03, 2019
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Class of Stock [Line Items]          
Proceeds from strategic partnership $ 375        
Proceeds from strategic partnership, share value received 361        
Proceeds from strategic partnership, cash portion $ 14        
Realized gain (loss) from strategic partnership   $ 0 $ 11    
Unrealized gain (loss) from strategic partnership   18 19    
Strategic Partnership Transactions, Unrealized Gain (Loss), Net   $ 18 $ 30    
Preferred shares issued   125,000 125,000   0
Preferred stock, par value (in usd per share)   $ 0.01 $ 0.01    
Proceeds from Issuance of Preferred Stock and Preference Stock     $ 121 $ 0  
Series A Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, par value (in usd per share)   $ 0.01 $ 0.01    
Proceeds from Issuance of Preferred Stock and Preference Stock     $ 125