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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 237 | [1] | $ 503 | [1]
Derivative Liability, Fair Value, Gross Liability | 231 | [1] | 380 | [1]
Accrued Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Deferred premium gain for fuel contracts, current | 8 |  | 0 |
Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Deferred premium receipt for fuel contracts, noncurrent | 4 |  | 2 |
Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 120 | [1] | 303 | [1]
Derivative Liability, Fair Value, Gross Liability | 127 | [1] | 78 | [1]
Not Designated as Hedging Instrument |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 117 | [1] | 200 | [1]
Derivative Liability, Fair Value, Gross Liability | 104 | [1] | 302 | [1]
Fuel derivatives | Accounts And Other Receivables |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Receivable from third parties for settled fuel contracts - current | 19 |  | 57 |
Fuel derivatives | Designated as Hedging Instrument | Prepaid expenses and other current assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 7 | [1] | 74 | [1]
Derivative Liability, Fair Value, Gross Liability | 2 | [1] | 0 | [1]
Fuel derivatives | Designated as Hedging Instrument | Accrued Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 4 | [1] | 0 | [1]
Derivative Liability, Fair Value, Gross Liability | 31 | [1] | 0 | [1]
Fuel derivatives | Designated as Hedging Instrument | Other Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 95 | [1] | 209 | [1]
Derivative Liability, Fair Value, Gross Liability | 33 | [1] | 1 | [1]
Fuel derivatives | Not Designated as Hedging Instrument | Prepaid expenses and other current assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 17 | [1] | 175 | [1]
Derivative Liability, Fair Value, Gross Liability | 10 | [1] | 182 | [1]
Fuel derivatives | Not Designated as Hedging Instrument | Accrued Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 36 | [1] | 9 | [1]
Derivative Liability, Fair Value, Gross Liability | 40 | [1] | 21 | [1]
Fuel derivatives | Not Designated as Hedging Instrument | Other Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 64 | [1] | 16 | [1]
Derivative Liability, Fair Value, Gross Liability | 54 | [1] | 99 | [1]
Interest rate derivatives | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Cash collateral deposits provided to counterparty - noncurrent | 24 |  | 32 |
Interest rate derivatives | Designated as Hedging Instrument | Other Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 14 | [1] | 20 | [1]
Derivative Liability, Fair Value, Gross Liability | 0 | [1] | 0 | [1]
Interest rate derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | [1] | 0 | [1]
Derivative Liability, Fair Value, Gross Liability | $ 61 | [1] | $ 77 | [1]
[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.

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- Definition Total cash that is already posted, at the end of the reporting period, as noncurrent collateral for derivative instruments with credit-risk-related contingent features. + References No definition available. + Details
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- Definition Amount received from third parties for fuel contracts that will settle in the current reporting period. + References No definition available. + Details
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- Definition Amount received from third parties for fuel contracts that will settle in future periods. + References No definition available. + Details
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- Definition Amount receivable from third parties for settled fuel contracts as of the end of the period reported, recorded in Accounts and other receivables on the balance sheet. + References No definition available. + 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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