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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Oct. 01, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 22 $ 8
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 (4) (61)
Available-for-sale Securities, Current 3 4
Available-for-sale Securities, Noncurrent 95 93
Deferred Compensation Assets 295 254
Total Assets 423 400
Derivative Liability, Netting (26) (69)
Total Liabilities 4 0
Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 9 45
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (1) (27)
Derivative Financial Instruments, Liabilities 0 0
Derivative Liability, Netting (9) (1)
Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 21 4
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (3) (34)
Derivative Financial Instruments, Liabilities 4 0
Derivative Liability, Netting (17) (68)
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 0
Deferred Compensation Assets 23 18
Total Assets 23 18
Total Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Designated as Hedging Instrument [Member]    
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 [Member] | Not Designated as Hedging Instrument [Member]    
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 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Current 2 2
Available-for-sale Securities, Noncurrent 45 38
Deferred Compensation Assets 272 236
Total Assets 353 386
Total Liabilities 30 69
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 10 72
Derivative Financial Instruments, Liabilities 9 1
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 24 38
Derivative Financial Instruments, Liabilities 21 68
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 1 2
Available-for-sale Securities, Noncurrent 50 55
Deferred Compensation Assets 0 0
Total Assets 51 57
Total Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Designated as Hedging Instrument [Member]    
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 [Member] | Not Designated as Hedging Instrument [Member]    
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