Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 27, 2015	Sep. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets and liabilities posted cash collateral		$ 16	$ 98
Derivative, Collateral, Obligation to Return Cash		0	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities, Current		2	1
Available for Sale Securities, Noncurrent		91	92
Deferred Compensation Assets		244	233
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(3)	(50)
Total Assets		377	335
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	(19)	(148)
Total Liabilities		0	12
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities, Current		0	0
Available for Sale Securities, Noncurrent		0	1
Deferred Compensation Assets		9	15
Total Assets		9	16
Total Liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities, Current		2	1
Available for Sale Securities, Noncurrent		30	24
Deferred Compensation Assets		235	218
Total Assets		310	302
Total Liabilities		19	160
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-Sale Securities, Current		0	0
Available for Sale Securities, Noncurrent		61	67
Deferred Compensation Assets		0	0
Total Assets		61	67
Total Liabilities		0	0
Commodity [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity Derivatives		40	9
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(3)	(50)
Derivative Financial Instruments, Liabilities		0	10
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(19)	(148)
Commodity [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity Derivatives		0	0
Derivative Financial Instruments, Liabilities		0	0
Commodity [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity Derivatives		43	59
Derivative Financial Instruments, Liabilities		19	158
Commodity [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity Derivatives		0	0
Derivative Financial Instruments, Liabilities		0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		0	0
Foreign Exchange Forward Contracts, Liabilities		0	2
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0
Foreign Exchange Forward Contracts, Liabilities		0	0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0
Foreign Exchange Forward Contracts, Liabilities		0	2
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0
Foreign Exchange Forward Contracts, Liabilities		$ 0	$ 0

[1] Our derivative assets and liabilities are presented in our Consolidated Condensed Balance Sheets on a net basis. We net derivative assets and liabilities, including cash collateral, when a legally enforceable master netting arrangement exists between the counterparty to a derivative contract and us. At June 27, 2015, and September 27, 2014, we had posted with various counterparties $16 million and $98 million, respectively, of cash collateral related to our commodity derivatives and held no cash collateral.