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

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Cash Flow Hedging

Derivative Instruments, Gain (Loss)

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

$ 0

$ 32

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

^[1]

0

32

Not Designated as Hedging Instrument | Other Nonoperating Income (Expense)

Derivative Instruments, Gain (Loss)

(Gain) loss recognized in income on derivatives

(2)

71

Fuel derivatives | Cash Flow Hedging

Derivative Instruments, Gain (Loss)

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

^[2]

1

32

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

^[1]

0

31

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

Derivative Instruments, Gain (Loss)

(Gain) loss recognized in income on derivatives

0

75

Interest rate derivatives | Cash Flow Hedging

Derivative Instruments, Gain (Loss)

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

^[2]

(1)

0

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

^[1]

0

1

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

Derivative Instruments, Gain (Loss)

(Gain) loss recognized in income on derivatives

$ (2)

$ (4)

[1]	Amounts are included in Other (gains) losses, net.
[2]	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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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+ References

No definition available.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
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-Publisher FASB
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-Topic 815
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993

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-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

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