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Debt - Debt Activity (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 13, 2019
USD ($)
Mar. 12, 2019
USD ($)
May 30, 2019
USD ($)
Feb. 28, 2019
USD ($)
Nov. 29, 2018
USD ($)
Mar. 01, 2018
USD ($)
Nov. 30, 2017
USD ($)
Feb. 28, 2019
USD ($)
Mar. 01, 2018
USD ($)
Aug. 30, 2018
USD ($)
Extinguishment of Debt [Line Items]                    
Current debt       $ 2,634,000,000       $ 2,634,000,000   $ 859,000,000
Increase (Decrease) in Principal (conversions, settlements, and issuances)               1,752,000,000    
Increase (Decrease) in Carrying Value               2,031,000,000    
Increase (Decrease) in Cash (conversions, settlements, and issuance of debt)               1,590,000,000    
Decrease in Equity       (336,000,000) $ (36,000,000) $ (252,000,000) $ (204,000,000) (372,000,000)    
Gain (Loss) on debt prepayments, repurchases, and conversions       (83,000,000)   $ (23,000,000)   $ (69,000,000) $ (218,000,000)  
Convertible Debt                    
Extinguishment of Debt [Line Items]                    
Derivative, Term of Contract               20 days    
Convertible Debt | 2032D Notes | Settled conversions                    
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 | Settled conversions                    
Extinguishment of Debt [Line Items]                    
Decrease in Principal               (38,000,000)    
Increase (Decrease) in Carrying Value               (169,000,000)    
Decrease in Cash               (164,000,000)    
Decrease in Equity               (8,000,000)    
Gain (Loss) on debt prepayments, repurchases, and conversions               13,000,000    
Convertible Debt | 2043G Notes | Conversions not settled                    
Extinguishment of Debt [Line Items]                    
Current debt       1,110,000,000       1,110,000,000    
Decrease in Principal               0    
Increase (Decrease) in Carrying Value               420,000,000    
Decrease in Cash               0    
Decrease in Equity               (336,000,000)    
Gain (Loss) on debt prepayments, repurchases, and conversions               (84,000,000)    
Subsequent Event | 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 Cash $ (1,430,000,000)                  
Gain (Loss) on debt prepayments, repurchases, and conversions     $ 316,000,000              
Corporate Bonds | 2024 Notes                    
Extinguishment of Debt [Line Items]                    
Current debt       0       0   0
Increase (Decrease) in Principal (conversions, settlements, 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]                    
Current debt       0       0   0
Increase (Decrease) in Principal (conversions, settlements, 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]                    
Current debt       $ 0       0   $ 0
Increase (Decrease) in Principal (conversions, settlements, and issuances)               700,000,000    
Increase (Decrease) in Carrying Value               695,000,000    
Increase in Cash               $ 695,000,000