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

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Cash Flow Hedging

Derivative Instruments, Gain (Loss) [Line Items]

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

$ (120)

$ 550

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

^[1]

622

251

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

^[2]

(14)

(13)

Not Designated as Hedging Instrument | Other Nonoperating Income Expense

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) loss recognized in income on derivatives

12

444

Fuel derivatives | Cash Flow Hedging

Derivative Instruments, Gain (Loss) [Line Items]

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

^[3]

(122)

546

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

^[1],[3]

613

238

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

^[2]

(11)

(9)

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

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) loss recognized in income on derivatives

14

444

Interest rate derivatives | Cash Flow Hedging

Derivative Instruments, Gain (Loss) [Line Items]

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

^[3]

2

4

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

^[1],[3]

9

13

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

^[2]

(3)

(4)

Interest rate derivatives | Not Designated as Hedging Instrument | Other Nonoperating Income Expense

Derivative Instruments, Gain (Loss) [Line Items]

(Gain) loss recognized in income on derivatives

$ (2)

$ 0

[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=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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+ References

No definition available.

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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
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959

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- Definition

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
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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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=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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