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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - Fuel derivatives $ in Millions | Mar. 31, 2016 USD ($)
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Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ (1,408) |
Cash collateral held from (by) CP | (1,067) |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty A |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (565) |
Cash collateral held from (by) CP | (544) |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (183) |
Cash collateral held from (by) CP | (140) |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty C |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (118) |
Cash collateral held from (by) CP | (12) |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (415) |
Cash collateral held from (by) CP | (355) |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty E |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (145) |
Cash collateral held from (by) CP | (31) |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty F |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (15) |
Cash collateral held from (by) CP | 15 |
Aircraft collateral pledged to CP | 0 |
Letters of credit (LC) | 0 |
Counterparty Other |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (3) | [1]
Cash collateral held from (by) CP | 0 | [1]
Aircraft collateral pledged to CP | 0 | [1]
Letters of credit (LC) | 0 | [1]
Minimum | Counterparty A |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (200) | [2]
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) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (600) |
Fair value of fuel derivative level at which cash is received from CP | 50 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (200) | [3]
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) |
Fair value of fuel derivative level at which cash is received from CP |  | [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | $ (200) |
Minimum | Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (100) | [5]
Option to substitute LC for cash Threshold 1 | (500) | [6]
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) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (500) |
Fair value of fuel derivative level at which cash is received from CP | 150 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (100) | [5]
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) |
Fair value of fuel derivative level at which cash is received from CP |  | [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | $ (100) |
Minimum | Counterparty C |  |
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 | (225) | [6]
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) |
Fair value of fuel derivative level at which cash is received from CP | $ 175 | [7]
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 |  | [4]
Fair value of fuel derivative level at which cash is received from CP |  | [4]
Minimum | Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | $ (150) | [5]
Option to substitute LC for cash Threshold 1 | (75) | [6]
Option to substitute LC for cash Threshold 2 | (550) | [6]
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) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (550) |
Fair value of fuel derivative level at which cash is received from CP | 250 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (150) | [5]
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) |
Fair value of fuel derivative level at which cash is received from CP |  | [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | $ (150) |
Minimum | Counterparty E |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (150) | [5]
Option to substitute LC for cash Threshold 1 | (75) | [6]
Option to substitute LC for cash Threshold 2 | (550) | [6]
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) |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (550) |
Fair value of fuel derivative level at which cash is received from CP | 75 |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (150) | [5]
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) |
Fair value of fuel derivative level at which cash is received from CP |  | [4]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | $ (150) |
Minimum | Counterparty F |  |
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) |
Fair value of fuel derivative level at which cash is received from CP | $ 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 |  | [4]
Fair value of fuel derivative level at which cash is received from CP |  | [4]
Maximum | Counterparty A |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | $ (600) | [2]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (600) | [3]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (600) |
Maximum | Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (500) | [5]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (500) | [5]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (500) |
Maximum | Counterparty C |  |
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 | (275) | [6]
Maximum | Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (550) | [5]
Option to substitute LC for cash Threshold 1 | (150) | [6]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (550) | [5]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (550) |
Maximum | Counterparty E |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (550) | [5]
Option to substitute LC for cash Threshold 1 | (150) | [6]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (550) | [5]
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) |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | $ (550) |
[1] | Individual counterparties with fair value of fuel derivatives <$5 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 requirements.
[3] | The Company has the option of providing cash or pledging aircraft as collateral.
[4] | Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
[5] | The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.
[6] | The Company has the option of providing cash or letters of credit as collateral.
[7] | Thresholds may vary based on changes in credit ratings within investment grade.
[8] | The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.

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