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Commitments (Tables)
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12 Months Ended | ||||||||||||||||||||||||
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Dec. 31, 2011
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| Commitments (Tables) [Abstract] | |||||||||||||||||||||||||
| Minimum Rental Commitments Schedule By Year Payable [Table Text Block] | Minimum rental commitments under all non-cancelable leases with an initial term in excess of one year were as follows as of December 31, 2011 (in millions):
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