Operating and Administrative Expenses (Tables)

12 Months Ended

Dec. 31, 2012

Operating Costs and Expenses [Abstract]

Rental Expenses Under Operating Leases [Table Text Block]

(In millions)	2012		2011		2010
Equipment for sublease	$	151	$	159	$	184
Other rental expense		410		456		453

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

(In millions)
2013		2014		2015		2016		2017
$	318	$	245	$	201	$	164	$	136