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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015:
 
 
 
 
Year ended December 31, 2016
 
Year ended December 31, 2015
(in millions)
Weighted-average useful life (in years)
 
Gross carrying
amount
 
Accumulated
amortization
 
Gross carrying amount
 
Accumulated Amortization
Customer relationships/marketing agreements
9

 
$
38

 
$
32

 
$
38

 
$
30

Trademarks/trade names
6

 
36

 
36

 
36

 
34

Owned domestic slots (a)
Indefinite

 
295

 
—

 
303

 
n/a

Leased domestic slots (a)
—

 
—

 
—

 
17

 
3

Gate leasehold rights (b)
15

 
180

 
55

 
180

 
43

Total
13

 
$
549

 
$
123

 
$
574

 
$
110


(a) The Company recorded a $21 million impairment associated with owned and leased slots at Newark Liberty International Airport as a result of the FAA announcement, in April 2016, that this airport was being changed to a Level 2 schedule-facilitated airport from its previous designation as Level 3.
(b) 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 this change in accounting principle recognized subsequent to the effective date of July 1, 2015, are as follows:

(in millions, except per share amounts)
Year ended December 31, 2016
 
Year ended December 31, 2015
Passenger revenue
$
(250
)
 
$
(89
)
Special revenue adjustment
—

 
172

Other revenue
794

 
344

Operating revenues
$
544

 
$
427

Net income
$
293

 
$
227

Net income per basic share
$
0.47

 
$
0.34

Net income per diluted share
$
0.46

 
$
0.34
Schedule of Change in Accounting Estimate
This change in estimate was recorded on a prospective basis, as of October 1, 2014. The impacts on revenue and earnings were as follows:

(in millions, except per share amounts)
 
Year ended December 31, 2015
Year ended December 31, 2014
Passenger revenue
 
$
115

$
55

Net income
 
$
61

$
29

Net income per basic share
 
$
0.09

$
0.04

Net income per diluted share
 
$
0.09

$
0.04

The impacts on expense and earnings from this change in assumption for the year ended December 31, 2016 are as follows:

(in millions, except per share amounts)
Year ended December 31, 2016
Depreciation and amortization expense
$
123

Net income *
$
(66
)
Net income per basic share
$
(0.11
)
Net income per diluted share
$
(0.10
)
* net of profitsharing benefit