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Special Charges (Tables)
 12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]  
Components of Special Charges
Special charges in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):
Operating:
 
2018
 
2017 (a)
 
2016 (a)
Impairment of assets
 
$
377

 
$
25

 
$
412

Termination of an engine maintenance service agreement
 
64

 
—

 
—

Severance and benefit costs
 
41

 
116

 
37

Cleveland airport lease restructuring
 
—

 
—

 
74

Labor agreement costs
 
—

 
—

 
171

(Gains) losses on sale of assets and other special charges
 
5

 
35

 
51

Total operating special charges
 
487

 
176

 
745

Nonoperating:
 
 
 
 
 
 
Postretirement curtailment gain
 
—

 
—

 
(107
)
Gains on extinguishment of debt and other
 
—

 
—

 
(1
)
Total operating and nonoperating special charges before income taxes
 
487

 
176

 
637

Nonoperating mark-to-market ("MTM") losses on financial instruments
 
5

 
—

 
—

Total special charges and MTM losses on financial instruments
 
492

 
176

 
637

Income tax benefit
 
(110
)
 
(63
)
 
(229
)
Income tax adjustments (Note 7)
 
(5
)
 
(179
)
 
180

Total special charges and MTM losses on financial instruments, net of income taxes and income tax adjustments
 
$
377

 
$
(66
)
 
$
588

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
Activity Related to the Accruals for Severance and Medical Costs and Future Lease Payments
Activity related to the accruals for severance and medical costs and future lease payments on permanently grounded aircraft is as follows (in millions):
 
Severance/ Benefit Costs
 
Permanently Grounded Aircraft
Balance at December 31, 2015
$
27

 
$
78

Accrual and related adjustments
37

 
(17
)
Payments
(50
)
 
(20
)
Balance at December 31, 2016
14

 
41

Accrual
116

 
(4
)
Payments
(93
)
 
(15
)
Balance at December 31, 2017
37

 
22

Accrual
41

 
(7
)
Payments
(53
)
 
(3
)
Balance at December 31, 2018
$
25

 
$
12