Financial Instruments And Risk Management (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Boe	Dec. 31, 2010	Dec. 31, 2009
Financial Instruments And Risk Management [Abstract]
Number of barrels of jet fuel derivative contracts outstanding	16,000,000
Fuel derivative maturity in months	12
Minimum R-squared percentage in fuel hedge contracts	80.00%
Minimum dollar offset correlation	80.00%
Maximum dollar offset correlation	125.00%
Recognized net gains (losses)	$ 335	$ (142)	$ (651)
Derivative instruments hedging agreements fair value	80	257
Net gains reclassified from accumulated other comprehensive loss into earnings	11
Cash collateral received	$ 0.5

Derivative Contract Maturity Term

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- Definition

Fuel Derivative Contract Non-Monetary Notional Amount

+ References

No definition available.

+ Details

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- Definition

The amount of cash received during the period on settlement of a hedge.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 133

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The upper end of the range of quotients represented as a percentage derived by dividing the change in value of a hedging instrument by the change in the value of the hedged item over the assessment period.

+ References

No definition available.

+ Details

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- Definition

The lower end of the range of quotients represented as a percentage derived by dividing the change in value of a hedging instrument by the change in the value of the hedged item over the assessment period.

+ References

No definition available.

+ Details

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- Definition

The correlation coefficient between the hypothetical instrument and the hedged item used in determination of the effectiveness of a hedging relationship.

+ References

No definition available.

+ Details

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- Definition

Fair value as of the balance sheet date of all price risk derivatives designated as fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 815

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