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Debt - Debt Repurchases and Conversions (Details) shares in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2017 USD ($) | Nov. 13, 2017 USD ($) | Oct. 17, 2017 USD ($) | Oct. 12, 2017 USD ($) | Aug. 31, 2017 USD ($) | Oct. 26, 2017 USD ($) shares | Nov. 30, 2017 USD ($) d | Aug. 31, 2017 USD ($) | Sep. 01, 2016 USD ($) | Sep. 03, 2015 USD ($) | Aug. 28, 2014 USD ($)
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | $ 2,558 | $ 870 | $ 2,329 |
(Decrease) in Equity |  |  |  |  |  |  |  | (33) | (38) | (691) |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | 99 | 4 | 49 |
Corporate bonds |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | 1,630 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | 94 |  |  |
Corporate bonds | 2025 Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face value of debt extinguished |  |  |  |  |  |  |  | 631 |  |  |
Increase (Decrease) in Carrying Value |  |  |  |  |  |  |  | (625) |  |  |
Corporate bonds | 2026 Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face value of debt extinguished |  |  |  |  |  |  |  | 321 |  |  |
Increase (Decrease) in Carrying Value |  |  |  |  |  |  |  | (318) |  |  |
Corporate bonds | 2022 Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face value of debt extinguished |  |  |  |  |  |  |  | 600 |  |  |
Increase (Decrease) in Carrying Value |  |  |  |  |  |  |  | (592) |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative debt liability |  |  |  |  |  |  |  |  |  |  | $ 275
Repayments of debt |  |  |  |  |  |  |  |  |  | 1,430 |
Face value of debt extinguished |  |  |  |  |  |  |  |  |  | 489 |
Increase (Decrease) in Carrying Value |  |  |  |  |  |  |  |  |  | (686) |
(Decrease) in Equity |  |  |  |  |  |  |  |  |  | $ (691) |
Convertible Debt | 2033E Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principle amount of 2033E Notes converted by holders |  |  |  |  | $ 58 |  |  |  |  |  |
Principle amount of 2033E Notes elected to be settled in cash |  |  |  |  | 16 |  |  |  |  |  |
Principle amount of 2033E Notes elected to be settled in cash and shares |  |  |  |  | 42 |  |  |  |  |  |
Derivative debt liability |  |  |  |  | $ 31 |  |  | $ 31 |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | 94 |  |
Face value of debt extinguished |  |  |  |  |  |  |  |  | 57 |  |
Increase (Decrease) in Carrying Value |  |  |  |  |  |  |  |  | (54) |  |
(Decrease) in Equity |  |  |  |  |  |  |  |  | $ (38) |  |
Subsequent Event | Secured Debt | 2023 Secured Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face value of debt extinguished |  |  | $ 812 | $ 438 |  |  |  |  |  |  |
Percentage of Principal Amount Redeemable Using Equity Offering Proceeds |  |  |  | 35.00% |  |  |  |  |  |  |
Subsequent Event | Convertible Debt | 2033E Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, Term of Contract, Consecutive Trading Days | d |  |  |  |  |  |  | 20 |  |  |  |
Repayments of debt |  |  |  |  |  | $ 92 |  |  |  |  |
Stock issued for conversion of 2033E Notes | shares |  |  |  |  |  | 3 |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  | $ 170 |  |  |  |
Scenario, Forecast | Secured Debt | 2023 Secured Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 885 | $ 470 |  |  |  |  |  |  |  |  |
Scenario, Forecast | Corporate bonds | 2023 Notes |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 1,050 |  |  |  |  |  |  |  |  |  |

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