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Operating and Administrative Expenses (Tables)
12 Months Ended
Dec. 31, 2014
Supplemental Cost Information [Abstract]  
Rental Expenses Under Operating Leases [Table Text Block]
(In millions)201420132012
Equipment for sublease$ 36 $ 64 $ 149
Other rental expense 346 364 390
Rental Expenses Under Operating Leases for Next Five Years
(In millions)20152016201720182019
$ 238 $ 203 $ 177 $ 141 $ 120