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Accumulated Other Comprehensive Income (Loss) (Notes)
 12 Months Ended
Dec. 31, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Comprehensive Income (Loss) Note [Text Block]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table shows the components of accumulated other comprehensive income (loss):
(in millions)
Pension and Other Benefits Liabilities
Derivative Contracts(1)
Deferred Tax Impact
Total
Balance at January 1, 2010
$
(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
)
Changes in value
(2,171
)
196

—

(1,975
)
Reclassification into earnings
149

15

—

164

Tax effect
774

(84
)
(690
)
—

Balance at December 31, 2012
$
(5,147
)
$
(286
)
$
(3,144
)
$
(8,577
)
 
(1) 
Includes $321 million of deferred income tax expense that will remain in AOCI until all amounts in AOCI that relate to fuel derivatives which are designated as accounting hedges are recognized in the Consolidated Statement of Operations.