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Commitments and Contingencies Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2014
Operating Leased Assets [Line Items]  
Operating Leases of Lessee Disclosure [Table Text Block]
As of December 31, 2014, future minimum annual lease payments, net of sublease income, under all non-cancelable operating leases were as follows:
(in millions)
 
Future Minimum Lease Payments
2015
 
$
491

2016
 
386

2017
 
329

2018
 
293

2019
 
240

Thereafter
 
464