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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Maximum Sum Of Derivatives Of Counterparty To Be Included In Other |  | $ 3,000,000 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts |  | 100.00% |
Letter of Credit Percent of Collateral |  | 100.00% |
Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - liability |  | $ (326,000,000) |
Total collateral already posted aggregate fair value |  | 301,000,000 | $ 835,000,000
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty A | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - liability |  | (298,000,000) |
Cash collateral held by CP |  | (279,000,000) |
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty B | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - liability |  | (78,000,000) |
Cash collateral held by CP |  | (33,000,000) |
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty C | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - asset |  | 36,000,000 |
Cash collateral held by CP |  | 0 |
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty D | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - liability |  | (5,000,000) |
Cash collateral held by CP |  | 0 |
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty E | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - asset |  | 3,000,000 |
Cash collateral held by CP |  | 0 |
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty F | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - asset |  | 12,000,000 |
Cash collateral held by CP |  | 11,000,000 |
Aircraft collateral pledged to CP |  | 0 |
Letters of credit (LC) |  | 0 |
Counterparty Other | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Fair value of fuel derivatives - asset | [1] | 4,000,000 |
Cash collateral held by CP | [1] | 0 |
Aircraft collateral pledged to CP | [1] | 0 |
Letters of credit (LC) | [1] | 0 |
Minimum | Counterparty A | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [2] | (200,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (50,000,000) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (600,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [3] | 50,000,000 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [4] | (200,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | 0 |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (600,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [5] |  |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (200,000,000) |
Minimum | Counterparty B | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [6] | (100,000,000) |
Option to substitute LC for cash Threshold 1 | [7] | (500,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (50,000,000) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (500,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [3] | 150,000,000 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [6] | (100,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | 0 |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (500,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [5] |  |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (100,000,000) |
Minimum | Counterparty C | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for cash Threshold 1 | [7] | (225,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (125,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [3] | 175,000,000 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | [5] |  |
Fair value of fuel derivative level at which cash is received from CP | [5] |  |
Minimum | Counterparty D | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [6] | (150,000,000) |
Option to substitute LC for cash Threshold 1 | [7] | (75,000,000) |
Option to substitute LC for cash Threshold 2 | [7] | (550,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (75,000,000) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (550,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [3] | 250,000,000 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [6] | (150,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | 0 |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (550,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [5] |  |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (150,000,000) |
Minimum | Counterparty E | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [6] | (150,000,000) |
Option to substitute LC for cash Threshold 1 | [7] | (125,000,000) |
Option to substitute LC for cash Threshold 2 | [7] | (550,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (125,000,000) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (550,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [3] | 75,000,000 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [6] | (150,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | 0 |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 |  | (550,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [5] |  |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (150,000,000) |
Minimum | Counterparty F | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for cash Threshold 1 | [8] |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (100,000,000) |
Fair value of fuel derivative level at which cash is received from CP | [3] | 0 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | [5] |  |
Fair value of fuel derivative level at which cash is received from CP | [5] |  |
Maximum | Counterparty A | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [2] | (600,000,000) |
Option to substitute LC for cash Threshold 1 |  |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (200,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [4] | (600,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (200,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (600,000,000) |
Maximum | Counterparty B | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [6] | (500,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (100,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [6] | (500,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (100,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (500,000,000) |
Maximum | Counterparty C | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for cash Threshold 1 | [7] | (275,000,000) |
Maximum | Counterparty D | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [6] | (550,000,000) |
Option to substitute LC for cash Threshold 1 | [7] | (150,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (150,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [6] | (550,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (150,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | (550,000,000) |
Maximum | Counterparty E | Fuel derivatives |  |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |  |
Option to substitute LC for aircraft | [6] | (550,000,000) |
Option to substitute LC for cash Threshold 1 | [7] | (150,000,000) |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (150,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | [6] | (550,000,000) |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | (150,000,000) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP |  | $ (550,000,000) |
[1] | Individual counterparties with fair value of fuel derivatives <$3 million.
[2] | The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirement.
[3] | Thresholds may vary based on changes in credit ratings within investment grade.
[4] | The Company has the option of providing cash or pledging aircraft as collateral.
[5] | Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
[6] | The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.
[7] | The Company has the option of providing cash or letters of credit as collateral.
[8] | The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.

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