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Commitments and Contingencies Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Future Minimum Annual Lease Payments [Abstract]  
Operating Leases of Lessee Disclosure [Table Text Block]
As of December 31, 2012, future minimum annual lease payments, net of sublease income, under all non-cancelable operating leases were as follows:
 
(in millions)
 
Future Minimum Lease Payments
2013
 
$
380

2014
 
357

2015
 
319

2016
 
277

2017
 
233

Thereafter
 
556