Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014		Sep. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets and liabilities posted cash collateral	$ 34		$ 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	110		92
Deferred Compensation Assets	235		233
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	34	[1]	50	[1]
Total Assets	375		335
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	68	[1]	148	[1]
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	17		1
Deferred Compensation Assets	5		15
Total Assets	22		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	28		24
Deferred Compensation Assets	230		218
Total Assets	322		302
Total Liabilities	68		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	65		67
Deferred Compensation Assets	0		0
Total Assets	65		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	28		9
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	34		50
Derivative Financial Instruments, Liabilities	0		10
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	68		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	62		59
Derivative Financial Instruments, Liabilities	68		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 December 27, 2014 and September 27, 2014, we had posted with various counterparties $34 million and $98 million, respectively, of cash collateral related to our commodity derivatives and held no cash collateral.