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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
(in millions)
Total
Six months ending December 31, 2013
$
775

2014
1,500

2015
790

2016
785

2017
735

Thereafter
3,110

Total
$
7,695