Debt - Schedule of Long-term Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended
	Mar. 05, 2015		Mar. 05, 2015		Feb. 12, 2015	Dec. 02, 2014	Aug. 28, 2014		Feb. 03, 2015
Debt Instrument [Line Items]
Current debt	$ 1,199,000,000		$ 1,199,000,000				$ 1,638,000,000
Long-term debt	5,519,000,000		5,519,000,000				4,955,000,000
Debt	6,718,000,000		6,718,000,000				6,593,000,000
Convertible Debt Issuances [Abstract]
Share Price (in dollars per share)	$ 29.28		$ 29.28
Capital lease obligations [Member]
Debt Instrument [Line Items]
Current debt	369,000,000	[1]	369,000,000	[1]			323,000,000	[1]
Long-term debt	576,000,000	[1]	576,000,000	[1]			588,000,000	[1]
Debt	945,000,000	[1]	945,000,000	[1]			911,000,000	[1]
Effective interest rate (in hundredths)	3.90%		3.90%				4.30%
Capital Lease Obligations [Abstract]
Capital Lease Obligations Incurred	287,000,000
Debt Instrument, Interest Rate, Effective Percentage, Incurred in Current Period	3.20%
Long-term Debt, by Maturity [Abstract]
Debt Instrument, Unamortized Discount	(77,000,000)		(77,000,000)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Remainder of 2015	202,000,000		202,000,000
2016	340,000,000		340,000,000
2017	164,000,000		164,000,000
2018	122,000,000		122,000,000
2019	85,000,000		85,000,000
2020 and thereafter	109,000,000		109,000,000
Debt Instrument, Unamortized Discount	(77,000,000)		(77,000,000)
Capital Lease Obligations	945,000,000		945,000,000
Capital lease obligations [Member] | Sales leaseback transactions [Member]
Capital Lease Obligations [Abstract]
Capital Lease Obligations Incurred	254,000,000
Reorganization obligation [Member]
Debt Instrument [Line Items]
Current debt	157,000,000		157,000,000				192,000,000
Long-term debt	684,000,000		684,000,000				939,000,000
Debt	841,000,000		841,000,000				1,131,000,000
Effective interest rate (in hundredths)	6.25%		6.25%
Secured Debt [Member] | 2019 senior notes
Debt Instrument [Line Items]
Current debt	92,000,000		92,000,000				92,000,000
Long-term debt	278,000,000		278,000,000				324,000,000
Debt	370,000,000		370,000,000				416,000,000
Stated interest rate (in hundredths)	1.258%		1.258%
Effective interest rate (in hundredths)	1.97%		1.97%
Corporate bonds [Member] | 2022 senior notes [Member]
Debt Instrument [Line Items]
Current debt	0		0				0
Long-term debt	600,000,000		600,000,000				600,000,000
Debt	600,000,000		600,000,000				600,000,000
Stated interest rate (in hundredths)	5.875%		5.875%
Effective interest rate (in hundredths)	6.14%		6.14%
Corporate bonds [Member] | 2023 senior notes [Member]
Debt Instrument [Line Items]
Current debt	0		0				0
Long-term debt	1,000,000,000		1,000,000,000				0
Debt	1,000,000,000		1,000,000,000				0
Stated interest rate (in hundredths)	5.25%		5.25%
Effective interest rate (in hundredths)	5.43%		5.43%
Unsecured Debt [Abstract]
Face Value of Debt									1,000,000,000
Payments of Debt Issuance Costs			12,000,000
Debt Instrument, Domestic Restricted Subsidiaries, Ownership Percentage by Parent	80.00%		80.00%
Debt Instrument, Redemption Price, Percentage			105.25%
Corporate bonds [Member] | 2023 senior notes [Member] | Maximum [Member]
Unsecured Debt [Abstract]
Debt Instrument Redemption Price Percentage of Principal Amount Redeemable Using Equity Offering Proceeds			35.00%
Corporate bonds [Member] | 2025 senior notes [Member]
Debt Instrument [Line Items]
Current debt	0		0				0
Long-term debt	1,150,000,000		1,150,000,000				1,150,000,000
Debt	1,150,000,000		1,150,000,000				1,150,000,000
Stated interest rate (in hundredths)	5.50%		5.50%
Effective interest rate (in hundredths)	5.56%		5.56%
Convertible Debt [Member]
Convertible Debt Issuances [Abstract]
Outstanding Principal	2,289,000,000		2,289,000,000
Underlying Shares (in shares)	157		157
Conversion value in excess of principal			2,334,000,000
Conversion rights, minimum number of trading days (in days)			20
Conversion rights, consecutive trading period (in days)			30 days
Conversion rights, threshold percentage of applicable conversion price (in hundredths)			130.00%
Convertible Debt [Member] | 2031B convertible senior notes [Member]
Debt Instrument [Line Items]
Current debt	0		0				362,000,000
Long-term debt	0		0				0
Debt	0		0				362,000,000
Stated interest rate (in hundredths)	1.875%		1.875%
Effective interest rate (in hundredths)	6.98%		6.98%
Convertible Debt [Member] | 2032C convertible senior notes [Member]
Debt Instrument [Line Items]
Current debt	0	[2],[3]	0	[2],[3]			0	[2]
Long-term debt	314,000,000	[2],[3]	314,000,000	[2],[3]			314,000,000	[2]
Debt	314,000,000	[2],[3]	314,000,000	[2],[3]			314,000,000	[2]
Stated interest rate (in hundredths)	2.375%		2.375%
Effective interest rate (in hundredths)	5.95%		5.95%
Convertible Debt Issuances [Abstract]
Debt Instrument Put Date Earliest			May 31, 2019	[4]
Outstanding Principal	357,000,000		357,000,000
Underlying Shares (in shares)	37		37
Conversion price per share (in dollars per share)	$ 9.63		$ 9.63
Conversion price per share threshold (in dollars per share)			$ 12.52	[5]
Conversion value in excess of principal			730,000,000	[6]
Convertible Debt [Member] | 2032D convertible senior notes [Member]
Debt Instrument [Line Items]
Current debt	0	[2],[3]	0	[2],[3]			0	[2]
Long-term debt	265,000,000	[2],[3]	265,000,000	[2],[3]			288,000,000	[2]
Debt	265,000,000	[2],[3]	265,000,000	[2],[3]			288,000,000	[2]
Stated interest rate (in hundredths)	3.125%		3.125%
Effective interest rate (in hundredths)	6.33%		6.33%
Convertible Debt Issuances [Abstract]
Debt Instrument Put Date Earliest			May 31, 2021	[4]
Outstanding Principal	313,000,000		313,000,000
Underlying Shares (in shares)	31		31
Conversion price per share (in dollars per share)	$ 9.98		$ 9.98
Conversion price per share threshold (in dollars per share)			$ 12.97	[5]
Conversion value in excess of principal			604,000,000	[6]
Convertible Debt [Member] | 2033E convertible senior notes [Member]
Debt Instrument [Line Items]
Current debt	275,000,000	[2],[3]	275,000,000	[2],[3]			278,000,000	[2]
Long-term debt	0	[2],[3]	0	[2],[3]			0	[2]
Debt	275,000,000	[2],[3]	275,000,000	[2],[3]			278,000,000	[2]
Stated interest rate (in hundredths)	1.625%		1.625%
Effective interest rate (in hundredths)	4.50%		4.50%
Convertible Debt Issuances [Abstract]
Debt Instrument Put Date Earliest			Feb. 28, 2018	[4]
Outstanding Principal	294,000,000		294,000,000
Underlying Shares (in shares)	27		27
Conversion price per share (in dollars per share)	$ 10.93		$ 10.93
Conversion price per share threshold (in dollars per share)			$ 14.21	[5]
Conversion value in excess of principal			492,000,000	[6]
Convertible Debt [Member] | 2033F convertible senior note [Member]
Debt Instrument [Line Items]
Current debt	268,000,000	[2],[3]	268,000,000	[2],[3]			265,000,000	[2]
Long-term debt	0	[2],[3]	0	[2],[3]			0	[2]
Debt	268,000,000	[2],[3]	268,000,000	[2],[3]			265,000,000	[2]
Stated interest rate (in hundredths)	2.125%		2.125%
Effective interest rate (in hundredths)	4.93%		4.93%
Convertible Debt Issuances [Abstract]
Debt Instrument Put Date Earliest			Feb. 28, 2020	[4]
Outstanding Principal	300,000,000		300,000,000
Underlying Shares (in shares)	27		27
Conversion price per share (in dollars per share)	$ 10.93		$ 10.93
Conversion price per share threshold (in dollars per share)			$ 14.21	[5]
Conversion value in excess of principal			504,000,000	[6]
Convertible Debt [Member] | 2043G convertible senior notes [Member]
Debt Instrument [Line Items]
Current debt	0	[2]	0	[2]			0	[2]
Long-term debt	642,000,000	[2]	642,000,000	[2]			636,000,000	[2]
Debt	642,000,000	[2]	642,000,000	[2]			636,000,000	[2]
Stated interest rate (in hundredths)	3.00%		3.00%
Effective interest rate (in hundredths)	6.76%		6.76%
Convertible Debt Issuances [Abstract]
Debt Instrument Put Date Earliest			Nov. 30, 2028	[4],[7]
Outstanding Principal	1,025,000,000	[7]	1,025,000,000	[7]
Underlying Shares (in shares)	35		35
Conversion price per share (in dollars per share)	$ 29.16		$ 29.16
Conversion price per share threshold (in dollars per share)			$ 37.91
Conversion value in excess of principal			4,000,000	[6]
Debt Instrument Issued At A Discount, Original Principal Amount	820,000,000		820,000,000
Debt Instrument, Scheduled Accreted Principal Amount	917,000,000		917,000,000
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Current debt	38,000,000		38,000,000				126,000,000
Long-term debt	10,000,000		10,000,000				116,000,000
Debt	48,000,000		48,000,000				242,000,000
Stated interest rate (in hundredths)	2.634%		2.634%
Effective interest rate (in hundredths)	2.63%		2.63%
Line of Credit [Member] | Revolving Credit Facility 1 [Member]
Line of Credit Facility [Abstract]
Debt instrument, original term					3 years
Terminated Line of Credit					255,000,000
Line of Credit [Member] | Revolving Credit Facility 4 [Member]
Line of Credit Facility [Abstract]
Debt instrument, original term			5 years
Line of Credit Facility, Maximum Borrowing Capacity	750,000,000		750,000,000
Percentage Of Collateral To Face Value Of Issued And Ouststanding Credit Facility	80.00%		80.00%
Line of Credit Facility, Current Borrowing Capacity	704,000,000		704,000,000
Line of Credit [Member] | Revolving Credit Facility 4 [Member] | Libor [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate financing (in hundredths)			1.75%
Line of Credit [Member] | Revolving Credit Facility 4 [Member] | Libor [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate financing (in hundredths)			2.25%
Line of Credit [Member] | Revolving Credit Facility 2 [Member]
Line of Credit Facility [Abstract]
Debt instrument, original term						3 years
Terminated Line of Credit						153,000,000
Line of Credit [Member] | Revolving Credit Facility 3 [Member]
Line of Credit Facility [Abstract]
Debt instrument, original term			5 years
Line of Credit Facility, Maximum Borrowing Capacity	540,000,000		540,000,000
Line of Credit Facility, Current Borrowing Capacity	473,000,000		473,000,000
Line of Credit [Member] | Revolving Credit Facility 3 [Member] | Libor [Member] | Minimum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate financing (in hundredths)			1.25%
Line of Credit [Member] | Revolving Credit Facility 3 [Member] | Libor [Member] | Maximum [Member]
Line of Credit Facility [Abstract]
Margin on variable rate financing (in hundredths)			1.75%
Loans Payable [Member]
Long-term Debt, by Maturity [Abstract]
Remainder of 2015	65,000,000		65,000,000
2016	287,000,000		287,000,000
2017	258,000,000		258,000,000
2018	551,000,000		551,000,000
2019	643,000,000		643,000,000
2020 and thereafter	4,561,000,000		4,561,000,000
Debt Instrument, Unamortized Discount	(592,000,000)		(592,000,000)
Notes Payable	5,773,000,000		5,773,000,000
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Debt Instrument, Unamortized Discount	$ (592,000,000)		$ (592,000,000)

[1] Weighted-average imputed rate of 3.9% and 4.3% as of March 5, 2015 and August 28, 2014, respectively.

[2] We have either the obligation or the option to pay cash for the principal amount due upon conversion for all of our convertible notes. Since it is our current intent to settle in cash the principal amount of all of our convertible notes upon conversion, the dilutive effect of such notes on earnings per share is computed under the treasury stock method.

[3] Since the closing price of our common stock for at least 20 trading days in the 30 trading day period ending on December 31, 2014 exceeded 130% of the conversion price per share, holders had the right to convert their notes at any time during the calendar quarter ended March 31, 2015. The closing price of our common stock also exceeded the thresholds for the calendar quarter ended March 31, 2015; therefore, these notes are convertible by the holders through June 30, 2015. The 2033 Notes are classified as current because the terms of these notes would require us to pay cash for the principal amount of any converted notes.

[4] The terms of our convertible notes give holders the right to require us to repurchase all or a portion of their notes at a date prior to the contractual maturities of the notes.

[5] Holders have the right to convert all or a portion of their notes at a date prior to the contractual maturity if, during any calendar quarter, the closing price of our common stock for at least 20 trading days in the 30 consecutive trading days ending on the last trading day of the preceding calendar quarter is more than 130% of the conversion price. The closing price of our common stock exceeded the thresholds for the calendar quarter ended March 31, 2015; therefore, our 2032 Notes and 2033 Notes notes are convertible by the holders through June 30, 2015.

[6] Based on our closing share price of $29.28 as of March 5, 2015.

[7] The original principal amount of $820 million accretes up to $917 million in November 2028 and $1.03 billion at maturity in 2043.