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Operating and Administrative Expenses (Tables)
12 Months Ended
Dec. 31, 2013
Supplemental Cost Information [Abstract]  
Operating Leases of Lessee Disclosure
(In millions)2013 2012 2011
         
Equipment for sublease$ 64 $149 $158
Other rental expense  364  390  434
         
Rental Expenses Under Operating Leases for Next Five Years
(In millions)
               
 2014 2015 2016 2017 2018
 $ 253 $ 213 $ 185 $ 153 $ 113