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Commitments and Contingencies (Tables)
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12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2013
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| Commitments And Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Future Minimum Lease Payments under These Non-cancelable Operating Leases | The approximate future minimum lease payments under these non-cancelable operating leases at December 31, 2013 are as follows (in millions):
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