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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017:

			Year ended December 31, 2018								Year ended December 31, 2017
(in millions)	Weighted-average useful life (in years)		Gross carrying amount				Accumulated amortization				Gross carrying amount				Accumulated Amortization
Customer relationships/marketing agreements	10		$	27			$	25			$	27			$	23
Owned domestic slots (a)	Indefinite		295				n/a				295				n/a
Gate leasehold rights (a)	15		180				78				180				66
Total	14		$	502			$	103			$	502			$	89

(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 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 and income taxes

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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.

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Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.

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