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Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
Operating Revenue by Geographic Region [Table Text Block]
 
Year Ended December 31,
(in millions)
2012
2011
2010
Domestic
$
23,827

$
22,722

$
20,744

Atlantic
6,481

6,486

5,931

Pacific
3,979

3,644

3,283

Latin America
2,383

2,263

1,797

Total
$
36,670

$
35,115

$
31,755