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Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table sets forth the changes in accumulated other comprehensive income (loss) by component (in millions):
 
 
Pension and retiree medical liability
 
Unrealized gain (loss) on investments
 
Derivative financial instruments
 
Income tax benefit (expense)
 
Total
Balance at December 31, 2012
 
$
(2,322
)
 
$
(1
)
 
$
15

 
$
(672
)
 
$
(2,980
)
     Other comprehensive income (loss) before reclassifications
 
—

 
—

 
(34
)
 
—

 
(34
)
     Amounts reclassified from accumulated other comprehensive income (loss)
 
(99
)
 
—

 
23

 
—

 
(76
)
Net current-period other comprehensive income (loss)
 
$
(99
)
 
$
—

 
$
(11
)
 
$
—

 
$
(110
)
Balance at September 30, 2013
 
$
(2,421
)
 
$
(1
)
 
$
4

 
$
(672
)
 
$
(3,090
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Reclassifications out of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2013 are as follows (in millions):

Details about accumulated other comprehensive income (loss) components
 
Amount reclassified from accumulated other comprehensive income (loss)
 
Affected line item in the statement where net income (loss) is presented
 
Three Months Ended September 30, 2013
 
Nine Months Ended September 30, 2013
 
Amortization of pension and retiree medical liability:
 
 
 
 
 
 
     Prior service cost
 
$
(54
)
 
$
(162
)
 
Wages, salaries and benefits
     Actuarial loss
 
21

 
63

 
Wages, salaries and benefits
 
 
 
 
 
 
 
Derivative financial instruments:
 
 
 
 
 
 
     Cash flow hedges
 
11

 
23

 
Aircraft fuel
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
(22
)
 
$
(76
)