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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Other Intangible Assets | The following table presents information about the Company’s goodwill and other intangible assets at December 31 (in millions):
|  |  |  |  | 2017 |  |  | 2016 |
Item |  | Asset life (a) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Goodwill |  |  |  |  |  | $ | 4,523 |  |  |  |  |  |  | $ | 4,523 |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequent flyer database (b) |  |  | 22 |  |  | $ | 1,177 |  |  | $ | 832 |  |  | $ | 1,177 |  |  | $ | 771 |
Hubs |  |  | 20 |  |  |  | 145 |  |  |  | 89 |  |  |  | 145 |  |  |  | 82 |
Contracts |  |  | 13 |  |  |  | 121 |  |  |  | 103 |  |  |  | 135 |  |  |  | 95 |
Patents and tradenames |  |  | 3 |  |  |  | 108 |  |  |  | 108 |  |  |  | 108 |  |  |  | 108 |
Airport slots and gates |  |  | 8 |  |  |  | 97 |  |  |  | 97 |  |  |  | 97 |  |  |  | 97 |
Other |  |  | 25 |  |  |  | 109 |  |  |  | 84 |  |  |  | 109 |  |  |  | 81 |
Total |  |  |  |  |  | $ | 1,757 |  |  | $ | 1,313 |  |  | $ | 1,771 |  |  | $ | 1,234 |
Indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Route authorities |  |  |  |  |  | $ | 1,562 |  |  |  |  |  |  | $ | 1,562 |  |  |  |  |
Airport slots and gates |  |  |  |  |  |  | 536 |  |  |  |  |  |  |  | 536 |  |  |  |  |
Tradenames and logos |  |  |  |  |  |  | 593 |  |  |  |  |  |  |  | 593 |  |  |  |  |
Alliances |  |  |  |  |  |  | 404 |  |  |  |  |  |  |  | 404 |  |  |  |  |
Total |  |  |  |  |  | $ | 3,095 |  |  |  |  |  |  | $ | 3,095 |  |  |  |  |
(a) Weighted average life expressed in years. (b) The frequent flyer database is amortized based on an accelerated amortization schedule to reflect utilization of the assets. Estimated cash flows correlating to the expected attrition rate of customers in the frequent flyer database is considered in the determination of the amortization schedules.

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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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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration