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Derivatives and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Price Risk Derivatives [Table Text Block]
The following table shows the impact of fuel hedge losses (gains) for both designated and undesignated contracts on aircraft fuel and related taxes:
 
Year Ended December 31,
(in millions)
2012
2011
2010
Market adjustments for changes in fair value
$
81

$
(187
)
$
2

Effective portion reclassified from AOCI to earnings
(15
)
(233
)
87

Losses (gains) recorded in aircraft fuel and related taxes
$
66

$
(420
)
$
89
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
signated as cash flow hedges.

Hedge Position as of December 31, 2012
(in millions)
Notional Balance
Final Maturity Date
Prepaid Expenses and Other Assets
Other Noncurrent Assets
Other Accrued Liabilities
Other Noncurrent Liabilities
Hedge Derivatives, net
Designated as hedges
 
 
 
 
 
 
 
 
Interest rate contracts (cash flow hedges)
$
740

U.S. dollars
May 2019
$
—

$
—

$
(22
)
$
(48
)
$
(70
)
Interest rate contracts (fair value hedges)
$
469

U.S. dollars
August 2022
—

6

(2
)
—

4

Foreign currency exchange contracts
119,277

Japanese yen
December 2015
62

63

(1
)
(1
)
123

430

Canadian dollars
Not designated as hedges
 
 
 
 
 
 
 
 
Fuel hedge contracts
1,792

gallons - heating oil, crude oil and jet fuel
December 2013
511

—

(262
)
—

249

Total derivative contracts
 
 
$
573

$
69

$
(287
)
$
(49
)
$
306


Hedge Position as of December 31, 2011
(in millions)
Notional Balance
Final Maturity Date
Prepaid Expenses and Other Assets
Other Noncurrent Assets
Other Accrued Liabilities
Other Noncurrent Liabilities
Hedge Derivatives, net
Designated as hedges
 
 
 
 
 
 
 
 
Interest rate contracts (cash flow hedges)
$
989

U.S. dollars
May 2019
$
—

$
—

$
(27
)
$
(57
)
$
(84
)
Interest rate contracts (fair value hedges)
$
500

U.S. dollars
August 2022
—

—

—

(7
)
(7
)
Foreign currency exchange contracts
126,993

Japanese yen
April 2014
7

5

(58
)
(43
)
(89
)
313

Canadian dollars
 
 
 
 
Not designated as hedges
 
 
 
 
 
 
 
 
Fuel hedge contracts
1,225

gallons - heating oil, crude oil, jet fuel and diesel
December 2012
570

—

(500
)
—

70

Total derivative contracts
 
 
$
577

$
5

$
(585
)
$
(107
)
$
(110
)


Hedge
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
Gains (losses) related to our designated hedge contracts, including those previously designated as accounting hedges, are as follows:
 
Effective Portion Reclassified from AOCI to Earnings
 
Effective Portion Recognized in Other Comprehensive Income (Loss)
 
Year Ended December 31,
(in millions)
2012
2011
2010
 
2012
2011
2010
Fuel hedge contracts
$
15

$
233

$
(87
)
 
$
(15
)
$
(166
)
$
153

Interest rate contracts
(5
)
—

(5
)
 
14

(8
)
(28
)
Foreign currency exchange contracts
(25
)
(61
)
(31
)
 
212

7

(73
)
Total designated
$
(15
)
$
172

$
(123
)
 
$
211

$
(167
)
$
52