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Special Charges and Mark-to-Market Adjustments (Tables)
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Components of Special Charges
For the three and nine months ended September 30, special charges consisted of the following (in millions):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
Operating:
2018
 
2017
 
2018
 
2017
Impairment of assets
$
11

 
$
15

 
$
145

 
$
15

Severance and benefit costs
9

 
23

 
34

 
101

(Gains) losses on sale of assets and other special charges
(3
)
 
12

 
7

 
29

Total special charges
17

 
50

 
186

 
145

Nonoperating mark-to-market ("MTM") (gains) losses on equity investments
(29
)
 
—

 
61

 
—

 Total special charges and MTM (gains) losses on equity investments
(12
)
 
50

 
247

 
145

Income tax expense (benefit)
3

 
(18
)
 
(55
)
 
(52
)
Total special charges and MTM (gains) losses on equity investments, net of tax
$
(9
)

$
32

 
$
192

 
$
93
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
34

 
—

Payments
(42
)
 
(2
)
Balance at September 30, 2018
$
29

 
$
20

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

 
$
41

Accrual
101

 
—

Payments
(84
)
 
(13
)
Balance at September 30, 2017
$
31

 
$
28