This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of a state or local jurisdiction in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

+ References+ Details

- Definition

Gross appreciation or the gross loss in value of the total of unsold available-for-sale securities during the period being reported (except when designated as a fair value hedge).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 55

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 24

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2009	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Income Taxes (Textual) [Abstract]
Operating loss Carryforwards federal						$ 1,920,000,000
Tax-effected net operating losses, state						82,000,000
Operating loss carryforwards, expiration dates						2024 through 2029
Income Tax Expense (Benefit)	21,000,000	1,000,000	(21,000,000)	21,000,000	1,000,000
Available-for-sale Securities, Income Tax Expense (Benefit) on Change in Unrealized Holding Gain or Loss	21,000,000			21,000,000
Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax			56,000,000	0	(1,000,000)
US Airways, Inc. [Member]
Income Taxes (Textual) [Abstract]
Operating loss Carryforwards federal						1,840,000,000
Tax-effected net operating losses, state						78,000,000
Operating loss carryforwards, expiration dates						2024 through 2029
Income Tax Expense (Benefit)	21,000,000	1,000,000	(21,000,000)	21,000,000	1,000,000
Available-for-sale Securities, Income Tax Expense (Benefit) on Change in Unrealized Holding Gain or Loss	21,000,000			21,000,000
Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax			56,000,000	0	(1,000,000)
US Airways, Inc. [Member] \| State valuation allowance [Member]
Income Taxes (Textual) [Abstract]
Valuation allowances						62,000,000
US Airways, Inc. [Member] \| Federal valuation allowance [Member]
Income Taxes (Textual) [Abstract]
Valuation allowances						388,000,000
US Airways, Inc. [Member] \| Identification of Net Operating Losses Included in Deferred Tax Assets [Member]
Income Taxes (Textual) [Abstract]
Operating loss Carryforwards federal						1,770,000,000
US Airways, Inc. [Member] \| Auction Rate Securities [Member]
Income Taxes (Textual) [Abstract]
Available-for-sale Securities, Income Tax Expense (Benefit) on Change in Unrealized Holding Gain or Loss	(21,000,000)		21,000,000
State valuation allowance [Member]
Income Taxes (Textual) [Abstract]
Valuation allowances						62,000,000
Federal valuation allowance [Member]
Income Taxes (Textual) [Abstract]
Valuation allowances						368,000,000
Identification of Net Operating Losses Included in Deferred Tax Assets [Member]
Income Taxes (Textual) [Abstract]
Operating loss Carryforwards federal						$ 1,850,000,000