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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.

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