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Commitments and Contigencies (Tables)
12 Months Ended
Dec. 31, 2012
Leases, Operating [Abstract]  
Minimum aggregate rental commitment under noncancelable operating leases

As of December 31, 2012, the minimum aggregate rental commitment under all noncancelable operating leases (net of subleases of $22 million) was as follows:

 

(Millions)  
2013 $275
2014  240
2015  199
2016  153
2017  131
Thereafter  1,005
Total $2,003