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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. 31, 2016
Oct. 01, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset $ 18 $ 8
Derivative, Collateral, Obligation to Return Cash 0 0
Derivative, Collateral, Right to Reclaim Cash 1  
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Current 4 4
Available for Sale Securities, Noncurrent 93 93
Deferred Compensation Assets 257 254
Derivative Asset, Netting [1] (22) (61)
Total Assets 384 400
Derivative Liability, Netting [1] (40) (69)
Total Liabilities 1 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 4 45
Derivative Asset, Netting 0 (27)
Derivative Financial Instruments, Liabilities 0 0
Derivative Liability, Netting (17) (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 26 4
Derivative Asset, Netting (22) (34)
Derivative Financial Instruments, Liabilities 1 0
Derivative Liability, Netting (23) (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 8 18
Total Assets 8 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 3 2
Available for Sale Securities, Noncurrent 39 38
Deferred Compensation Assets 249 236
Total Assets 343 386
Total Liabilities 41 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 4 72
Derivative Financial Instruments, Liabilities 17 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 48 38
Derivative Financial Instruments, Liabilities 24 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 54 55
Deferred Compensation Assets 0 0
Total Assets 55 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
[1] (a)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 31, 2016, and October 1, 2016, we had posted with various counterparties $18 million and $8 million, respectively, of cash collateral related to our commodity derivatives and held no cash collateral. At December 31, 2016, we had posted, with a single counterparty, $1 million of cash collateral where a legally enforceable master netting arrangement did not exist.