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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Finite Lived Intangible Assets | The following table is a summary of the Company’s intangible assets, which are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2017 and 2016:
|  |  | Year ended December 31, 2017 |  | Year ended December 31, 2016
(in millions) | Weighted-average useful life (in years) |  | Gross carrying amount |  | Accumulated amortization |  | Gross carrying amount |  | Accumulated Amortization
Customer relationships/marketing agreements | 10 |  | $ | 27 |  |  | $ | 23 |  |  | $ | 38 |  |  | $ | 32 |
Owned domestic slots (a) | Indefinite |  | 295 |  |  | n/a |  |  | 295 |  |  | n/a |
Gate leasehold rights (a) | 15 |  | 180 |  |  | 66 |  |  | 180 |  |  | 55 |
Total | 14 |  | $ | 502 |  |  | $ | 89 |  |  | $ | 513 |  |  | $ | 87 |
(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates, takeoff and landing slots (a "slot" is the right of an air carrier, pursuant to regulations of the FAA, to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets acquired.
Schedule of New Accounting Principles - Chase Agreement | The estimated impacts on revenue and earnings associated with the Agreement and the resulting required change in accounting methodology recognized subsequent to the effective date of July 1, 2015, are as follows:
(in millions, except per share amounts) | Year ended December 31, 2017 |  | Year ended December 31, 2016 |  | Year ended December 31, 2015
Passenger revenue | $ | (364 | ) |  | $ | (250 | ) |  | $ | (89 | )
Special revenue adjustment | — |  |  | — |  |  | 172 |
Other revenue | 908 |  |  | 794 |  |  | 344 |
Operating revenues | $ | 544 |  |  | $ | 544 |  |  | $ | 427 |
Net income | $ | 496 |  |  | $ | 293 |  |  | $ | 227 |
Net income per basic share | $ | 0.82 |  |  | $ | 0.47 |  |  | $ | 0.34 |
Net income per diluted share | $ | 0.82 |  |  | $ | 0.46 |  |  | $ | 0.34 |
Schedule of Change in Accounting Estimate | The impacts on expense and earnings from the accelerated depreciation were as follows:
(in millions, except per share amounts) | Year ended December 31, 2017 | Year ended December 31, 2016
Depreciation and amortization expense | $ | 21 |  | $ | 123 |
Net income * | $ | (19 | ) | $ | (66 | )
Net income per basic share | $ | (0.03 | ) | $ | (0.11 | )
Net income per diluted share | $ | (0.03 | ) | $ | (0.10 | )
* net of profitsharing benefit

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- Definition Tabular disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e777-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6368906&loc=d3e21843-107793 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22595-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(a)(5)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 + Details
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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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