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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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Net increase or decrease in the carrying amount of the debt instrument for the period.

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