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New Accounting Pronouncement and Changes in Accounting or Estimates (Tables)
 6 Months Ended
Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]  
Schedule of New Changes in Accounting Principles - Chase Agreement
The estimated impacts on revenue and earnings associated with the Agreement and this change in accounting principle for the three and six months ended June 30, 2016 are as follows:

(in millions, except per share amounts)
Three months ended June 30, 2016
 
Six months ended June 30, 2016
Passenger revenue
$
(66
)
 
$
(120
)
Other revenue
203

 
381

Operating revenues
$
137

 
$
261

Net income
$
73

 
$
139

Net income per basic share
$
0.12

 
$
0.22

Net income per diluted share
$
0.11

 
$
0.22
Schedule of Change in Accounting Estimate - Depreciation
The estimated impacts on expense and earnings from this change in assumption for the three and six months ended June 30, 2016 are as follows:

(in millions, except per share amounts)
Three months ended June 30, 2016
 
Six months ended June 30, 2016
Depreciation expense
$
34

 
$
62

Net income
$
(18
)
 
$
(33
)
Net income per basic share
$
(0.03
)
 
$
(0.05
)
Net income per diluted share
$
(0.03
)
 
$
(0.05
)