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Commitments and Contigencies (Tables)
12 Months Ended
Dec. 31, 2014
Table Text Block [Abstract]  
Minimum aggregate rental commitment under noncancelable operating leases

As of December 31, 2014, the minimum aggregate rental commitment under all non-cancelable operating leases (net of subleases of $34 million) was as follows:

(Millions)  
2015  $189
2016  161
2017  144
2018  126
2019  94
Thereafter  921
Total  $1,635