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Hedging Activities (Schedule of Gain Loss on Derivative Instruments) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Hedging Activities
Amount of Gain Recognized in AOCI on Derivatives (Effective portion)	$ (231)	$ (146)	$ 293	$ (146)
Gain Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)	278		432
Amount of Gain Recognized in Income (Nonoperating Expense)(Ineffective Portion)	$ (34)	$ (3)	$ (31)	$ (3)

The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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