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Commitments and Contigencies (Tables)
12 Months Ended
Dec. 31, 2011
Leases, Operating [Abstract]  
Minimum aggregate rental commitment under noncancelable operating leases

As of December 31, 2011, the minimum aggregate rental commitment under all noncancelable operating leases (net of subleases of $27 million) was as follows:

 

(Millions)  
2012 $255
2013  221
2014  201
2015  160
2016  119
Thereafter  1,048
Total $2,004