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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 2 $ 22
Derivative, Collateral, Obligation to Return Cash 18 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 3
Available for Sale Securities, Noncurrent 96 95
Deferred compensation assets 301 295
Derivative Asset, Netting [1] (44) (4)
Total assets 427 423
Derivative Liability, Netting [1] (28) (26)
Total liabilities 1 4
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 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 45 45
Deferred compensation assets 288 272
Total assets 406 353
Total liabilities 29 30
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 51 50
Deferred compensation assets 0 0
Total assets 52 51
Total liabilities 0 0
Other Current Assets [Member] | 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 10 9
Derivative Asset, Netting (15) (1)
Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Assets 18 21
Derivative Asset, Netting (29) (3)
Other Current Assets [Member] | 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
Other Current Assets [Member] | 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
Other Current Assets [Member] | 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 25 10
Other Current Assets [Member] | 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 47 24
Other Current Assets [Member] | 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
Other Current Assets [Member] | 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
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Designated as hedges    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Liabilities 0 0
Derivative Liability, Netting 0 (9)
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Liabilities 1 4
Derivative Liability, Netting (28) (17)
Other Current Liabilities [Member] | 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, Liabilities 0 0
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Liabilities 0 0
Other Current Liabilities [Member] | 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, Liabilities 0 9
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Liabilities 29 21
Other Current Liabilities [Member] | 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, Liabilities 0 0
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 | Undesignated    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Financial Instruments, Liabilities $ 0 $ 0
[1] Our derivative assets and liabilities are presented in our Consolidated Condensed Balance Sheets on a net basis when a legally enforceable master netting arrangement exists between the counterparty to a derivative contract and us. Additionally, at March 31, 2018, and September 30, 2017, we had $2 million and $22 million, respectively, of cash collateral posted with various counterparties where master netting arrangements exist and held $18 million in cash collateral at March 31, 2018.