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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 30, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 33 $ 22
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]    
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 5 (4)
Available-for-Sale Securities, Current 2 3
Available for Sale Securities, Noncurrent 96 95
Deferred compensation assets 305 295
Total assets 430 423
Derivative Liability, Netting (27) (26)
Total liabilities 3 4
Fair Value, Measurements, Recurring [Member] | Designated as hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 8 9
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 2 (1)
Derivative Financial Instruments, Liabilities 0 0
Derivative Liability, Netting (12) (9)
Fair Value, Measurements, Recurring [Member] | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 19 21
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 3 (3)
Derivative Financial Instruments, Liabilities 3 4
Derivative Liability, Netting (15) (17)
Fair Value, Measurements, Recurring [Member] | Level 1    
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 0
Deferred compensation assets 13 23
Total assets 13 23
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 | Designated as hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 0 0
Derivative Financial Instruments, Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 0 0
Derivative Financial Instruments, Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Current 1 2
Available for Sale Securities, Noncurrent 46 45
Deferred compensation assets 292 272
Total assets 361 353
Total liabilities 30 30
Fair Value, Measurements, Recurring [Member] | Level 2 | Designated as hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 6 10
Derivative Financial Instruments, Liabilities 12 9
Fair Value, Measurements, Recurring [Member] | Level 2 | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 16 24
Derivative Financial Instruments, Liabilities 18 21
Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Current 1 1
Available for Sale Securities, Noncurrent 50 50
Deferred compensation assets 0 0
Total assets 51 51
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 | Designated as hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 0 0
Derivative Financial Instruments, Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 0 0
Derivative Financial Instruments, Liabilities $ 0 $ 0