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Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2015

Jun. 30, 2014

Jun. 30, 2015

Jun. 30, 2014

Cash Flow Hedging

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) Loss recognized in AOCI on derivatives (effective portion)

$ (34)

$ (119)

$ 19

$ (105)

(Gain) Loss reclassified from AOCI into income (effective portion)

^[1]

44

2

93

6

(Gain) Loss recognized in income on derivatives (ineffective portion)

^[2]

(3)

(28)

(17)

(42)

Fuel derivatives | Cash Flow Hedging

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) Loss recognized in AOCI on derivatives (effective portion)

^[3]

(33)

(122)

16

(110)

(Gain) Loss reclassified from AOCI into income (effective portion)

^[1],[3]

41

(1)

87

(1)

(Gain) Loss recognized in income on derivatives (ineffective portion)

^[2]

(2)

(28)

(15)

(41)

Interest rate derivatives | Cash Flow Hedging

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) Loss recognized in AOCI on derivatives (effective portion)

^[3]

(1)

3

3

5

(Gain) Loss reclassified from AOCI into income (effective portion)

^[1],[3]

3

3

6

7

(Gain) Loss recognized in income on derivatives (ineffective portion)

^[2]

(1)

0

(2)

(1)

Other Nonoperating Income Expense | Fuel derivatives | Not Designated as Hedging Instrument

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) loss recognized in income on derivatives

$ 71

$ 16

$ 91

$ (40)

[1]	Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
[2]	Amounts are included in Other (gains) losses, net.
[3]	Net of tax

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4A



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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-Publisher FASB



-Name Accounting Standards Codification



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The effective portion of net gain (loss) 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 Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



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-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959



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

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



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Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4C



-Subparagraph (d)(1)



-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959



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