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Special Charges (Tables)
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Components of Special charges
For the three and six months ended June 30, special charges consisted of the following (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
Operating:
2018
 
2017
 
2018
 
2017
Impairment of assets
$
111

 
$
—

 
$
134

 
$
—

Severance and benefit costs
11

 
41

 
25

 
78

(Gains) losses on sale of assets and other special charges
7

 
3

 
10

 
17

Special charges
129

 
44

 
169

 
95

Income tax benefit related to special charges
(29
)
 
(16
)
 
(38
)
 
(34
)
Total special charges, net of tax
$
100


$
28

 
$
131

 
$
61
Accrual Activity
Activity related to these accruals is as follows (in millions):
 
Severance and Benefits
 
Permanently Grounded Aircraft
Balance at December 31, 2017
$
37

 
$
22

Accrual
25

 
—

Payments
(34
)
 
(2
)
Balance at June 30, 2018
$
28

 
$
20

 
Severance and Benefits
 
Permanently Grounded Aircraft
Balance at December 31, 2016
$
14

 
$
41

Accrual
78

 
—

Payments
(65
)
 
(12
)
Balance at June 30, 2017
$
27

 
$
29