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Commitments and Contigencies (Tables)
12 Months Ended
Dec. 31, 2013
Leases, Operating [Abstract]  
Minimum aggregate rental commitment under noncancelable operating leases

As of December 31, 2013, the minimum aggregate rental commitment under all noncancelable operating leases (net of subleases of $23 million) was as follows:

(Millions)  
2014 $237
2015  196
2016  157
2017  132
2018  114
Thereafter  922
Total $1,758