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Debt - Debt Activity (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 13, 2019
USD ($)
Mar. 12, 2019
USD ($)
May 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Nov. 29, 2018
USD ($)
May 31, 2018
USD ($)
Mar. 01, 2018
USD ($)
Nov. 30, 2017
USD ($)
May 30, 2019
USD ($)
May 31, 2018
USD ($)
Extinguishment of Debt [Line Items]                    
Increase (Decrease) in Principal (conversions and issuances)                 $ 728,000,000  
Increase (Decrease) in Carrying Value                 916,000,000  
Increase (Decrease) in Cash (conversions and issuances)                 144,000,000  
Decrease in Equity     $ (5,000,000) $ (336,000,000) $ (36,000,000) $ (985,000,000) $ (252,000,000) $ (204,000,000) (377,000,000)  
Gain (Loss) on debt prepayments, repurchases, and conversions     (317,000,000)     $ (168,000,000)     $ (386,000,000) $ (386,000,000)
Convertible Debt                    
Extinguishment of Debt [Line Items]                    
Derivative, Term of Contract                 20 days  
Convertible Debt | 2032D Notes                    
Extinguishment of Debt [Line Items]                    
Decrease in Principal                 $ (10,000,000)  
Increase (Decrease) in Carrying Value                 (9,000,000)  
Decrease in Cash                 (35,000,000)  
Decrease in Equity                 (28,000,000)  
Gain (Loss) on debt prepayments, repurchases, and conversions                 2,000,000  
Convertible Debt | 2033F Notes                    
Extinguishment of Debt [Line Items]                    
Decrease in Principal                 (43,000,000)  
Increase (Decrease) in Carrying Value                 (173,000,000)  
Decrease in Cash                 (184,000,000)  
Decrease in Equity                 (23,000,000)  
Gain (Loss) on debt prepayments, repurchases, and conversions                 12,000,000  
Convertible Debt | 2043G Notes                    
Extinguishment of Debt [Line Items]                    
Conversion rate (in shares per $1000 principal)   34.2936                
Principal amount used In conversion rate   $ 1,000                
Decrease in Principal                 (1,019,000,000)  
Increase (Decrease) in Carrying Value                 (691,000,000)  
Decrease in Cash $ (1,430,000,000)               (1,426,000,000)  
Decrease in Equity   $ (336,000,000)             (326,000,000)  
Gain (Loss) on debt prepayments, repurchases, and conversions     $ (316,000,000) $ (84,000,000)         (400,000,000)  
Corporate Bonds | 2024 Notes                    
Extinguishment of Debt [Line Items]                    
Increase (Decrease) in Principal (conversions and issuances)                 600,000,000  
Increase (Decrease) in Carrying Value                 597,000,000  
Increase in Cash                 597,000,000  
Corporate Bonds | 2026 Notes                    
Extinguishment of Debt [Line Items]                    
Increase (Decrease) in Principal (conversions and issuances)                 500,000,000  
Increase (Decrease) in Carrying Value                 497,000,000  
Increase in Cash                 497,000,000  
Corporate Bonds | 2029 Notes                    
Extinguishment of Debt [Line Items]                    
Increase (Decrease) in Principal (conversions and issuances)                 700,000,000  
Increase (Decrease) in Carrying Value                 695,000,000  
Increase in Cash                 $ 695,000,000