Income Taxes (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Examination [Line Items]
Unrecognized federal tax benefit						$ 762,000,000
Alternative minimum tax						370,000,000
Deferred income tax provision related to indefinite-lived intangible assets	8,000,000	[1]		22,000,000
State and international tax expense				8,000,000
American Taxpayer Relief Act of 2012 credit					22,000,000
Income tax provision (benefit)	7,000,000		0	360,000,000	(22,000,000)
AA [Member]
Income Tax Examination [Line Items]
Unrecognized federal tax benefit						647,000,000
Alternative minimum tax						467,000,000
Deferred income tax provision related to indefinite-lived intangible assets	7,000,000			21,000,000
Non-cash tax provision on sale of fuel hedging contracts				328,000,000
State and international tax expense				3,000,000
Income tax provision (benefit)	5,000,000		0	351,000,000	(30,000,000)
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
NOL subject to expiration						4,700,000,000
Valuation allowance						415,000,000
State and Local Jurisdiction [Member] | AA [Member]
Income Tax Examination [Line Items]
NOL subject to expiration						3,800,000,000
Valuation allowance						378,000,000
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
NOL subject to expiration						10,600,000,000
Valuation allowance						4,600,000,000
Internal Revenue Service (IRS) [Member] | AA [Member]
Income Tax Examination [Line Items]
NOL subject to expiration						9,500,000,000
Valuation allowance						4,900,000,000
Fuel Hedging Contract [Member]
Income Tax Examination [Line Items]
Non-cash tax provision on sale of fuel hedging contracts				330,000,000
Fuel Hedging Contract [Member] | AA [Member]
Income Tax Examination [Line Items]
Non-cash tax provision on sale of fuel hedging contracts	$ 328,000,000			$ 328,000,000

[1] During the 2014 third quarter, the Company recorded a special $8 million non-cash deferred income tax provision related to certain indefinite-lived intangible assets. During the 2014 nine month period, the Company sold its portfolio of fuel hedging contracts that were scheduled to settle on or after June 30, 2014. In connection with this sale, the Company recorded a special non-cash tax provision of $330 million in the statement of operations for the second quarter of 2014 that reversed the non-cash tax provision which was recorded in Other Comprehensive Income (OCI), a subset of stockholders’ equity, principally in 2009. This provision represents the tax effect associated with gains recorded in OCI principally in 2009 due to a net increase in the fair value of the Company’s fuel hedging contracts. In accordance with GAAP, the Company retained the $330 million tax provision in OCI until the last contract was settled or terminated. In addition, the 2014 nine month period included a special $22 million non-cash deferred income tax provision related to certain indefinite-lived intangible assets.