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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Cost (Income)
The following table provides the components of net periodic benefit cost (income) (in millions):
 
 
Pension Benefits
 
Retiree Medical and Other
Postretirement Benefits
Three Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
1

 
$
1

 
$
1

 
$
1

Interest cost
 
169

 
180

 
9

 
10

Expected return on assets
 
(226
)
 
(198
)
 
(6
)
 
(5
)
Amortization of:
 
 
 
 
 
 
 
 
Prior service cost (benefit)
 
7

 
7

 
(59
)
 
(59
)
Unrecognized net loss (gain)
 
36

 
36

 
(5
)
 
(6
)
Net periodic benefit cost (income)
 
$
(13
)
 
$
26

 
$
(60
)
 
$
(59
)
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Retiree Medical and Other
Postretirement Benefits
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2

 
$
2

 
$
3

 
$
3

Interest cost
 
507

 
541

 
26

 
29

Expected return on assets
 
(678
)
 
(592
)
 
(17
)
 
(16
)
Amortization of:
 
 
 
 
 
 
 
 
Prior service cost (benefit)
 
21

 
21

 
(178
)
 
(178
)
Unrecognized net loss (gain)
 
108

 
108

 
(15
)
 
(17
)
Net periodic benefit cost (income)
 
$
(40
)
 
$
80

 
$
(181
)
 
$
(179
)
American Airlines, Inc. [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Cost (Income)
The following table provides the components of net periodic benefit cost (income) (in millions):
 
 
Pension Benefits
 
Retiree Medical and Other
Postretirement Benefits
Three Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
1

 
$
—

 
$
1

 
$
1

Interest cost
 
168

 
179

 
9

 
10

Expected return on assets
 
(225
)
 
(197
)
 
(6
)
 
(5
)
Amortization of:
 
 
 
 
 
 
 
 
Prior service cost (benefit)
 
7

 
7

 
(59
)
 
(59
)
Unrecognized net loss (gain)
 
35

 
36

 
(5
)
 
(6
)
Net periodic benefit cost (income)
 
$
(14
)
 
$
25

 
$
(60
)
 
$
(59
)
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Retiree Medical and Other
Postretirement Benefits
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
2

 
$
1

 
$
3

 
$
3

Interest cost
 
504

 
538

 
26

 
29

Expected return on assets
 
(675
)
 
(589
)
 
(17
)
 
(16
)
Amortization of:
 
 
 
 
 
 
 
 
Prior service cost (benefit)
 
21

 
21

 
(178
)
 
(178
)
Unrecognized net loss (gain)
 
107

 
108

 
(15
)
 
(17
)
Net periodic benefit cost (income)
 
$
(41
)
 
$
79

 
$
(181
)
 
$
(179
)