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Debt - Debt Prepayments, Repurchases, and Conversions (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Oct. 12, 2018
Aug. 30, 2018
Aug. 31, 2017
Sep. 01, 2016
Extinguishment of Debt [Line Items]        
Current debt   $ 859 $ 1,262  
Decrease in Cash   (10,194) (2,558) $ (870)
Gain (Loss) on Extinguishment of Debt   (385) (99) (4)
Decrease in Equity   (2,243) (33) (38)
Gain (Loss) on debt prepayments, repurchases, and conversions   (385) (100) (4)
Secured Debt | 2021 MSAC Term Loan        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (730)    
Increase (Decrease) in Carrying Value   (727)    
Decrease in Cash   (730)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (3)    
Secured Debt | 2021 MSTW Term Loan        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (2,625)    
Increase (Decrease) in Carrying Value   (2,616)    
Decrease in Cash   (2,625)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (10)    
Secured Debt | 2023 Secured Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (1,250)    
Increase (Decrease) in Carrying Value   (1,238)    
Decrease in Cash   (1,373)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (135)    
Corporate Bonds        
Extinguishment of Debt [Line Items]        
Decrease in Cash     (1,630)  
Gain (Loss) on Extinguishment of Debt     (94)  
Corporate Bonds | 2023 Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (1,000)    
Increase (Decrease) in Carrying Value   (991)    
Decrease in Cash   (1,046)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (55)    
Corporate Bonds | 2024 Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (550)    
Increase (Decrease) in Carrying Value   (546)    
Decrease in Cash   (572)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (25)    
Corporate Bonds | 2026 Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (129) (321)  
Increase (Decrease) in Carrying Value   (129) (318)  
Decrease in Cash   (139)    
Gain (Loss) on debt prepayments, repurchases, and conversions   $ (11)    
Corporate Bonds | 2025 Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal     (631)  
Increase (Decrease) in Carrying Value     (625)  
Corporate Bonds | 2022 Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal     (600)  
Increase (Decrease) in Carrying Value     $ (592)  
Convertible Debt        
Extinguishment of Debt [Line Items]        
Derivative, Term of Contract (in consecutive trading days)   20 days    
Convertible Debt | 2033F Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal   $ (66)    
Increase (Decrease) in Carrying Value   (63)    
Decrease in Cash   (316)    
Decrease in Equity   (252)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (1)    
Convertible Debt | 2033F Notes | Settled conversions        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (124)    
Increase (Decrease) in Carrying Value   (118)    
Decrease in Cash   (596)    
Decrease in Equity   (462)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (16)    
Convertible Debt | 2033F Notes | Conversions not settled        
Extinguishment of Debt [Line Items]        
Current debt   165    
Decrease in Principal [1]   0    
Increase (Decrease) in Carrying Value [1]   132    
Decrease in Cash [1]   0    
Decrease in Equity [1]   (117)    
Gain (Loss) on debt prepayments, repurchases, and conversions [1]   (15)    
Principal amount of settlement obligations to be settled in cash in Q1-19   35    
Convertible Debt | 2032C Notes | Settled conversions        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (223)    
Increase (Decrease) in Carrying Value   (216)    
Decrease in Cash   (1,230)    
Decrease in Equity   (965)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (50)    
Convertible Debt | 2032D Notes | Settled conversions        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (34)    
Increase (Decrease) in Carrying Value   (31)    
Decrease in Cash   (182)    
Decrease in Equity   (145)    
Gain (Loss) on debt prepayments, repurchases, and conversions   $ (6)    
Convertible Debt | 2033E Notes        
Extinguishment of Debt [Line Items]        
Decrease in Principal       (57)
Increase (Decrease) in Carrying Value       (54)
Decrease in Cash       (94)
Decrease in Equity       $ (38)
Treasury shares issued for conversion of 2033E Notes   4    
Convertible Debt | 2033E Notes | Settled conversions        
Extinguishment of Debt [Line Items]        
Decrease in Principal   $ (173)    
Increase (Decrease) in Carrying Value   (203)    
Decrease in Cash [2]   (552)    
Decrease in Equity   (297)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (52)    
Convertible Debt | 2043G Notes | Settled conversions        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (6)    
Increase (Decrease) in Carrying Value   (4)    
Decrease in Cash   (13)    
Decrease in Equity   (5)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (4)    
Notes Payable, Other Payables        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (46)    
Increase (Decrease) in Carrying Value   (44)    
Decrease in Cash   (46)    
Gain (Loss) on debt prepayments, repurchases, and conversions   (2)    
Unscheduled Settlement Activities        
Extinguishment of Debt [Line Items]        
Decrease in Principal   (6,956)    
Increase (Decrease) in Carrying Value   (6,794)    
Decrease in Cash   (9,420)    
Decrease in Equity   $ (2,243)    
Subsequent Event | Convertible Debt | 2033F Notes        
Extinguishment of Debt [Line Items]        
Decrease in Cash $ (153)      
[1] As of August 30, 2018, an aggregate of $35 million principal amount of our 2033F Notes (with a carrying value of $165 million) had converted but not settled. These notes settled in the first quarter of 2019 for $153 million in cash.
[2] Settlement included issuance of 4 million shares of our treasury stock in addition to payment of cash.