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Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Operating Revenue by Geographic Region [Table Text Block]
 
Year Ended December 31,
(in millions)
2013
2012
2011
Domestic
$
24,857

$
23,989

$
22,722

Atlantic
6,446

6,329

6,486

Pacific
4,086

4,198

3,644

Latin America
2,384

2,154

2,263

Total
$
37,773

$
36,670

$
35,115