Financial Instruments And Risk Management (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 barrel	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	22,000,000
Derivative, Higher Remaining Maturity Range	18 months
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (12)	$ 4	$ 341
Price Risk Cash Flow Hedge Derivative, at Fair Value	107	62
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer	12 months
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	45
AA [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	22,000,000
Derivative, Higher Remaining Maturity Range	18 months
Minimum R-squared percentage in fuel hedge contracts	80.00%
Minimum dollar offset correlation	80.00%
Maximum dollar offset correlation	125.00%
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(12)	4	301
Price Risk Cash Flow Hedge Derivative, at Fair Value	107	62
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer	12 months
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 45