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Fair Value Measurements - Measured on Recurring Basis (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 237 | [1] |  | $ 503 | [1]
Fuel derivatives: |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | (231) | [1] |  | (380) | [1]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 |  |  | 0 |
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount | 0 |  |  | 0 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 |  |  | 0 |
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount | 0 |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0 |  | 0 |  |
Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Treasury bills | 1,500 |  |  | 1,570 |
Interest rate derivatives | 14 |  |  | 20 |
Other available for sale securities | 67 |  |  | 63 |
Total assets | 3,892 |  |  | 3,757 |
Liabilities |  |  |  |  |
Interest rate derivatives | (61) |  |  | (77) |
Deferred Compensation | (162) |  |  | (158) |
Total Liabilities | (393) |  |  | (538) |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Treasury bills | 1,500 |  |  | 1,570 |
Interest rate derivatives | 0 |  |  | 0 |
Other available for sale securities | 62 |  |  | 58 |
Total assets | 2,979 |  |  | 2,620 |
Liabilities |  |  |  |  |
Interest rate derivatives | 0 |  |  | 0 |
Deferred Compensation | (162) |  |  | (158) |
Total Liabilities | (162) |  |  | (158) |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Treasury bills | 0 |  |  | 0 |
Interest rate derivatives | 14 |  |  | 20 |
Other available for sale securities | 0 |  |  | 0 |
Total assets | 669 |  |  | 626 |
Liabilities |  |  |  |  |
Interest rate derivatives | (61) |  |  | (77) |
Deferred Compensation | 0 |  |  | 0 |
Total Liabilities | (71) |  |  | (85) |
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Treasury bills | 0 |  |  | 0 |
Interest rate derivatives | 0 |  |  | 0 |
Other available for sale securities | 5 |  |  | 5 |
Total assets | 244 |  |  | 511 |
Liabilities |  |  |  |  |
Interest rate derivatives | 0 |  |  | 0 |
Deferred Compensation | 0 |  |  | 0 |
Total Liabilities | (160) |  |  | (295) |
Cash Equivalents | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 1,417 | [2] |  | 992 | [2]
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 1,417 | [2] |  | 992 | [2]
Cash Equivalents | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 | [2] |  | 0 | [2]
Cash Equivalents | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 | [2] |  | 0 | [2]
Commercial paper | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 220 |  |  | 280 |
Commercial paper | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Commercial paper | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 220 |  |  | 280 |
Commercial paper | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 21 |  |  | 23 |
Certificates of deposit | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 21 |  |  | 23 |
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Eurodollar time deposits | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 174 |  |  | 60 |
Eurodollar time deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Eurodollar time deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 174 |  |  | 60 |
Eurodollar time deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  |  | 0 |
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Investments | 228 |  |  | 227 |
Certificates of deposit | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Investments | 0 |  |  | 0 |
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Investments | 228 |  |  | 227 |
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Investments | 0 |  |  | 0 |
Auction rate securities | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Assets |  |  |  |  |
Investments | 28 | [3] |  | 39 | [3]
Auction rate securities | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Assets |  |  |  |  |
Investments | 0 | [3] |  | 0 | [3]
Auction rate securities | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Assets |  |  |  |  |
Investments | 0 | [3] |  | 0 | [3]
Auction rate securities | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Assets |  |  |  |  |
Investments | 28 | [3] |  | 39 | [3]
Swap | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 11 | [4] |  | 16 | [4]
Derivative Liability, Fair Value, Gross Asset | 1 | [5] |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability | (2) | [4] |  | (8) | [4]
Derivative Liability, Fair Value, Gross Liability | (8) | [5] |  |  |
Swap | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Asset | 0 | [5] |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability |  | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Liability |  | [5] |  |  |
Swap | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 11 | [4] |  | 16 | [4]
Derivative Liability, Fair Value, Gross Asset | 1 | [5] |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability | (2) | [4] |  | (8) | [4]
Derivative Liability, Fair Value, Gross Liability | (8) | [5] |  |  |
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Asset | 0 | [5] |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability |  | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Liability |  | [5] |  |  |
Options Held | Fair Value, Measurements, Recurring | Period end date |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 172 | [4] |  | 458 | [4]
Derivative Liability, Fair Value, Gross Asset | 39 | [5] |  | 9 | [6]
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability | (97) | [4] |  | (274) | [4]
Derivative Liability, Fair Value, Gross Liability | (63) | [5] |  | (21) | [6]
Options Held | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Asset | 0 | [5] |  | 0 | [6]
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability | 0 | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Liability |  | [5] |  | 0 | [6]
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Asset | 0 | [5] |  | 0 | [6]
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability | 0 | [4] |  | 0 | [4]
Derivative Liability, Fair Value, Gross Liability |  | [5] |  | 0 | [6]
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |  |  |  |
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 172 | [4] |  | 458 | [4]
Derivative Liability, Fair Value, Gross Asset | 39 | [5] |  | 9 | [6]
Fuel derivatives: |  |  |  |  |
Derivative Asset, Fair Value, Gross Liability | (97) | [4] |  | (274) | [4]
Derivative Liability, Fair Value, Gross Liability | $ (63) | [5] |  | $ (21) | [6]
[1] | Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.
[2] | Cash equivalents are primarily composed of money market investments.
[3] | Noncurrent investments are included in Other assets in the unaudited Condensed Consolidated Balance Sheet.
[4] | In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net asset.
[5] | In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net liability.
[6] | In the unaudited Condensed Consolidated Balance Sheet amounts are presented as a net liability

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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