Fair Value Measurements (Narrative) (Details) - USD ($)	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Ineffective portions of derivative instruments designated in accordance with accounting standards as cash flow hedge relationships	$ 1,000,000
Letters of credit posted as collateral under fuel hedging program	2,000,000
Hedging gains and losses in accumulated other comprehensive income expected to be recognized in earnings, net of tax	8,000,000
Carrying Value [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Long Term Debt And Capital Lease Obligation	2,756,000,000	$ 2,787,000,000
Estimated Fair Value [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of total debt	2,838,000,000	$ 2,888,000,000
Fuel Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	30,000,000
Interest Rate Swap Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate notional amount	$ 650,000,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans, commercial paper and capital lease obligations.

+ References

No definition available.

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 25
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986

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