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For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified, and which are expected to be realized or consumed after one year or beyond the normal operating cycle, if longer. For an unclassified balance sheet, represents both current and noncurrent other assets.

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For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended
Discontinued Operations (Details) (USD $)	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 26, 2010	Sep. 26, 2010	Jun. 27, 2010	Mar. 28, 2010	Dec. 27, 2009	Sep. 25, 2011	Sep. 26, 2010	Sep. 27, 2009
Disposal Group, Not Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues									$ 5,000,000	$ 9,000,000	$ 29,000,000
Loss from discontinued operations									(507,000,000)	(459,000,000)	(327,000,000)
Income tax benefit									194,000,000	186,000,000	127,000,000
Discontinued operations, net of income taxes	(6,000,000)	44,000,000	(269,000,000)	(82,000,000)	(73,000,000)	(65,000,000)	(78,000,000)	(57,000,000)	(313,000,000)	(273,000,000)	(200,000,000)
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]
Current assets	10,000,000								10,000,000
Property, plant and equipment, net	156,000,000								156,000,000
Assets held for sale	746,000,000				0				746,000,000	0
Other assets	1,000,000								1,000,000
Total assets	913,000,000								913,000,000
Trade accounts payable	2,000,000								2,000,000
Payroll and other benefits related liabilities	2,000,000								2,000,000
Other current liabilities	75,000,000								75,000,000
Other noncurrent liabilities	183,000,000								183,000,000
Total liabilities	262,000,000								262,000,000
Date announced sale of spectrum licenses									Dec. 20, 2010
Sale price of spectrum licenses	1,900,000,000								1,900,000,000
Carrying value of spectrum held for sale	$ 746,000,000				$ 0				$ 746,000,000	$ 0