Debt - Schedule of Long-term Debt (Details) $ / shares in Units, shares in Millions, $ in Millions			1 Months Ended	3 Months Ended		6 Months Ended
		Dec. 01, 2015 USD ($)	Apr. 08, 2016 USD ($)	Mar. 03, 2016 USD ($) $ / shares		Mar. 03, 2016 USD ($) integer shares $ / shares		Sep. 03, 2015 USD ($)
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 1,125		$ 1,125		$ 1,089
Long-term debt				6,494		6,494		6,252
Debt				$ 7,619		$ 7,619		7,341
Convertible Debt Issuances [Abstract]
Share Price (in dollars per share) | $ / shares				$ 11.79		$ 11.79
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Remainder of 2016				$ 209		$ 209
2017				298		298
2018				251		251
2019				209		209
2020				101		101
2021 and thereafter				124		124
Capital Leases, Future Minimum Payments, Interest Included in Payments				(92)		(92)
Capital Lease Obligations				1,100		1,100
Reorganization obligation [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				167		167		161
Long-term debt				601		601		701
Debt				$ 768		$ 768		862
Effective interest rate (in thousandths)				6.25%		6.25%
Capital lease obligations [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt	[1]			$ 338		$ 338		326
Long-term debt	[1]			762		762		466
Debt	[1]			$ 1,100		$ 1,100		$ 792
Weighted average effective interest rate (in thousandths)				3.30%		3.30%		3.70%
Leases, Capital [Abstract]
Capital Lease Obligations Incurred						$ 444
Capital lease obligations [Member] | Sales-leaseback transactions [Member]
Leases, Capital [Abstract]
Capital Lease Obligations Incurred				$ 424		424
Percentage, Incurred in Current Period				2.70%
Weighted Average Remaining Term				4 years
Secured Debt [Member] | 1.258% senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 87		87		$ 87
Long-term debt				174		174		217
Debt				$ 261		$ 261		304
Stated interest rate (in thousandths)				1.258%		1.258%
Effective interest rate (in thousandths)				1.97%		1.97%
Secured Debt [Member] | Term Loan B Credit Facility [Member] | Libor [Member] | Initiation of New Financing Arrangements [Member]
Subsequent Events [Abstract]
Expected Amount of Notes To Be Issued Through Syndication Process			$ 500
Expected Term of Notes To Be Issued Through Syndication Process			6 years
Corporate bonds [Member] | 2022 senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 0		$ 0		0
Long-term debt				589		589		589
Debt				$ 589		$ 589		589
Stated interest rate (in thousandths)				5.875%		5.875%
Effective interest rate (in thousandths)				6.14%		6.14%
Corporate bonds [Member] | 2023 senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 0		$ 0		0
Long-term debt				989		989		988
Debt				$ 989		$ 989		988
Stated interest rate (in thousandths)				5.25%		5.25%
Effective interest rate (in thousandths)				5.43%		5.43%
Corporate bonds [Member] | 2024 senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 0		$ 0		0
Long-term debt				545		545		545
Debt				$ 545		$ 545		545
Stated interest rate (in thousandths)				5.25%		5.25%
Effective interest rate (in thousandths)				5.38%		5.38%
Corporate bonds [Member] | 2025 senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 0		$ 0		0
Long-term debt				1,139		1,139		1,138
Debt				$ 1,139		$ 1,139		1,138
Stated interest rate (in thousandths)				5.50%		5.50%
Effective interest rate (in thousandths)				5.56%		5.56%
Corporate bonds [Member] | 2026 senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				$ 0		$ 0		0
Long-term debt				446		446		446
Debt				$ 446		$ 446		446
Stated interest rate (in thousandths)				5.625%		5.625%
Effective interest rate (in thousandths)				5.73%		5.73%
Convertible Debt [Member]
Convertible Debt Issuances [Abstract]
Outstanding principal				$ 1,899		$ 1,899
Underlying Shares (shares issuable upon conversion) | shares						119
Conversion value in excess of principal	[2]					$ 119
Conversion rights, minimum number of trading days (in days) | integer						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] | 2032C convertible senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt	[4]			0	[3]	$ 0	[3]	0
Long-term debt	[4]			200	[3]	200	[3]	197
Debt	[4]			$ 200	[3]	$ 200	[3]	197
Stated interest rate (in thousandths)				2.375%		2.375%
Effective interest rate (in thousandths)				5.95%		5.95%
Convertible Debt Issuances [Abstract]
Holder Put Date (Earliest)	[5]					May 31, 2019
Outstanding principal				$ 224		$ 224
Underlying Shares (shares issuable upon conversion) | shares						23
Initial conversion, price per share | $ / shares				$ 9.63		$ 9.63
Conversion price per share threshold (dollars per share) | $ / shares	[6]					$ 12.52
Conversion value in excess of principal	[2]					$ 50
Convertible Debt [Member] | 2032D convertible senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt	[4]			$ 0	[3]	0	[3]	0
Long-term debt	[4]			152	[3]	152	[3]	150
Debt	[4]			$ 152	[3]	$ 152	[3]	150
Stated interest rate (in thousandths)				3.125%		3.125%
Effective interest rate (in thousandths)				6.33%		6.33%
Convertible Debt Issuances [Abstract]
Holder Put Date (Earliest)	[5]					May 31, 2021
Outstanding principal				$ 177		$ 177
Underlying Shares (shares issuable upon conversion) | shares						18
Initial conversion, price per share | $ / shares				$ 9.98		$ 9.98
Conversion price per share threshold (dollars per share) | $ / shares	[6]					$ 12.97
Conversion value in excess of principal	[2]					$ 32
Convertible Debt [Member] | 2033E convertible senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt	[4]			$ 166	[3]	166	[3]	217
Long-term debt	[4]			0	[3]	0	[3]	0
Debt	[4]			$ 166	[3]	$ 166	[3]	217
Stated interest rate (in thousandths)				1.625%		1.625%
Effective interest rate (in thousandths)				4.50%		4.50%
Convertible Debt Issuances [Abstract]
Holder Put Date (Earliest)	[5]					Feb. 28, 2018
Outstanding principal				$ 176		$ 176
Underlying Shares (shares issuable upon conversion) | shares						16
Initial conversion, price per share | $ / shares				$ 10.93		$ 10.93
Conversion price per share threshold (dollars per share) | $ / shares	[6]					$ 14.21
Conversion value in excess of principal	[2]					$ 13
Convertible Debt [Member] | 2033F convertible senior note [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt	[4]			$ 267	[3]	267	[3]	264
Long-term debt	[4]			0	[3]	0	[3]	0
Debt	[4]			$ 267	[3]	$ 267	[3]	264
Stated interest rate (in thousandths)				2.125%		2.125%
Effective interest rate (in thousandths)				4.93%		4.93%
Convertible Debt Issuances [Abstract]
Holder Put Date (Earliest)	[5]					Feb. 28, 2020
Outstanding principal				$ 297		$ 297
Underlying Shares (shares issuable upon conversion) | shares						27
Initial conversion, price per share | $ / shares				$ 10.93		$ 10.93
Conversion price per share threshold (dollars per share) | $ / shares	[6]					$ 14.21
Conversion value in excess of principal	[2]					$ 24
Convertible Debt [Member] | 2043G convertible senior notes [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt	[4]			$ 0		0		0
Long-term debt	[4]			650		650		644
Debt	[4]			$ 650		$ 650		644
Stated interest rate (in thousandths)				3.00%		3.00%
Effective interest rate (in thousandths)				6.76%		6.76%
Convertible Debt Issuances [Abstract]
Holder Put Date (Earliest)	[5],[7]					Nov. 30, 2028
Outstanding principal	[7]			$ 1,025		$ 1,025
Underlying Shares (shares issuable upon conversion) | shares						35
Initial conversion, price per share | $ / shares				$ 29.16		$ 29.16
Conversion price per share threshold (dollars per share) | $ / shares	[6]					$ 37.91
Conversion value in excess of principal	[2]					$ 0
Debt Instrument Issued At A Discount Original Principal Amount	[7]			$ 820		820
Debt Instrument, Scheduled Accreted Principal Amount	[7]			917		917
Debt Instrument, Face Amount	[7]			1,030		1,030
Other notes payable [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Current debt				100		100		34
Long-term debt				247		247		171
Debt				$ 347		$ 347		$ 205
Weighted average stated interest rate (in thousandths)				2.519%		2.519%
Weighted average effective interest rate (in thousandths)				2.70%		2.70%
Other notes payable [Member] | Secured Debt 6 [Member]
Long-term Debt, by Current and Noncurrent [Abstract]
Debt				$ 194		$ 194
Convertible Debt Issuances [Abstract]
Proceeds from Issuance of Other Long-term Debt		$ 174
Debt instrument, original term						3 years
Other notes payable [Member] | Secured Debt 6 [Member] | Libor [Member]
Convertible Debt Issuances [Abstract]
Debt Instrument Variable Reference Rate Period 1						3 months
Other notes payable [Member] | Secured Debt 6 [Member] | Libor [Member] | Maximum [Member]
Convertible Debt Issuances [Abstract]
Margin on variable rate financing (in hundredths)						2.20%
Loans Payable [Member]
Long-term Debt, by Maturity [Abstract]
Remainder of 2016				97		$ 97
2017				362		362
2018				521		521
2019				530		530
2020				711		711
2021 and thereafter				4,844		4,844
Unamortized amounts				(546)		(546)
Notes Payable				$ 6,519		$ 6,519
Senior Secured Notes [Member] | Senior Secured Notes [Member] | Maximum [Member] | Initiation of New Financing Arrangements [Member]
Subsequent Events [Abstract]
Amount of Senior Secured Notes Considering To Be Issued			$ 1,000

[1] Weighted-average imputed rate of 3.3% and 3.7% as of March 3, 2016 and September 3, 2015, respectively.

[2] Based on our closing share price of $11.79 as of March 3, 2016.

[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, 2015 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, 2016. The closing price of our common stock did not meet the thresholds for the calendar quarter ended March 31, 2016; therefore, these notes are not convertible by the holders after March 31, 2016. The 2033 Notes are classified as current because the terms of these notes also require us to pay cash for the principal amount of any converted notes.

[4] 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.

[5] 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 maturity at a price equal to the principal amount thereof plus accrued interest.

[6] 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 December 31, 2015 for our 2032 Notes and 2033 Notes; therefore, those notes were convertible by the holders through March 31, 2016. The closing price of our common stock did not meet the thresholds for the calendar quarter ended March 31, 2016; therefore, these notes are not convertible by the holders after March 31, 2016.

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