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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table shows the components of accumulated other comprehensive income (loss):
(in millions)
Pension and Other Benefits Liabilities
Derivative Contracts(1)
Deferred Tax Valuation Allowance
Total
Balance at January 1, 2009
$
(1,702
)
$
(863
)
$
(1,515
)
$
(4,080
)
Changes in value
(540
)
(20
)
—

(560
)
Reclassification into earnings
48

1,350

—

1,398

Income Tax Allocation
—

(321
)
—

(321
)
Tax effect
183

(491
)
308

—

Balance at December 31, 2009
(2,011
)
(345
)
(1,207
)
(3,563
)
Changes in value
(121
)
(71
)
—

(192
)
Reclassification into earnings
54

123

—

177

Tax effect
25

(19
)
(6
)
—

Balance at December 31, 2010
(2,053
)
(312
)
(1,213
)
(3,578
)
Changes in value
(3,062
)
5

—

(3,057
)
Reclassification into earnings
41

(172
)
—

(131
)
Tax effect
1,175

66

(1,241
)
—

Balance at December 31, 2011
$
(3,899
)
$
(413
)
$
(2,454
)
$
(6,766
)
 
(1) 
Includes $321 million of deferred income tax expense that will remain in accumulated other comprehensive loss until all amounts in accumulated other comprehensive loss that relate to fuel derivatives which are designated as accounting hedges are recognized in the Consolidated Statement of Operations. All amounts relating to our fuel derivative contracts that were previously designated as accounting hedges will be recognized by June 2012 (original settlement date of those contracts). As a result, a non-cash income tax expense of $321 million will be recognized in the June 2012 quarter unless we enter into and designate additional fuel derivative contracts as accounting hedges prior to June 2012.