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INCOME TAXES | 12 Months Ended
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Dec. 31, 2014
Income Tax Disclosure [Abstract] |
INCOME TAXES | INCOME TAXES Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The components of deferred tax assets and liabilities at December 31, 2014 and 2013, are as follows:
(in millions) |  | 2014 |  | 2013
DEFERRED TAX LIABILITIES: |  |  |  |
Accelerated depreciation |  | $ | 4,277 |  |  | $ | 4,069 |
Fuel derivative instruments |  | — |  |  | 36 |
Other |  | 51 |  |  | 84 |
Total deferred tax liabilities |  | 4,328 |  |  | 4,189 |
DEFERRED TAX ASSETS: |  |  |  |
Fuel derivative instruments |  | 521 |  |  | 8 |
Deferred gains from sale and leaseback of aircraft |  | 20 |  |  | 24 |
Capital and operating leases |  | 125 |  |  | 163 |
Construction obligation |  | 209 |  |  | 168 |
Accrued engine maintenance |  | 83 |  |  | 90 |
Accrued employee benefits |  | 334 |  |  | 307 |
State taxes |  | 65 |  |  | 74 |
Business partner income |  | 90 |  |  | 457 |
Net operating losses and credit carryforwards |  | 3 |  |  | 14 |
Other |  | 96 |  |  | 118 |
Total deferred tax assets |  | 1,546 |  |  | 1,423 |
Net deferred tax liability |  | $ | 2,782 |  |  | $ | 2,766 |
The provision for income taxes is composed of the following:
(in millions) |  | 2014 |  | 2013 |  | 2012
CURRENT: |  |  |  |  |  |
Federal |  | $ | 203 |  |  | $ | 355 |  |  | $ | (45 | )
State |  | 29 |  |  | 44 |  |  | 12 |
Total current |  | 232 |  |  | 399 |  |  | (33 | )
DEFERRED: |  |  |  |  |  |
Federal |  | 421 |  |  | 62 |  |  | 287 |
State |  | 27 |  |  | (6 | ) |  | 10 |
Total deferred |  | 448 |  |  | 56 |  |  | 297 |
|  | $ | 680 |  |  | $ | 455 |  |  | $ | 264 |
The effective tax rate on income before income taxes differed from the federal income tax statutory rate for the following reasons:
(in millions) |  | 2014 |  | 2013 |  | 2012
Tax at statutory U.S. tax rates |  | $ | 636 |  |  | $ | 423 |  |  | $ | 240 |
Nondeductible items |  | 9 |  |  | 10 |  |  | 10 |
State income taxes, net of federal benefit |  | 37 |  |  | 25 |  |  | 14 |
Other, net |  | (2 | ) |  | (3 | ) |  | — |
Total income tax provision |  | $ | 680 |  |  | $ | 455 |  |  | $ | 264 |
During 2014, the Company continued to maintain and did not adjust, a $5 million liability for unrecognized tax benefits, the majority of which related to AirTran’s tax positions in prior years. The only periods subject to examination for the Company’s federal tax return are the 2013 and 2014 tax years.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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