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Contingencies and commitments Contingencies and commitments (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||
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Dec. 31, 2012
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||
| Minimum future rental commitments under non-cancelable operating leases | The following table summarizes the minimum future rental commitments under non-cancelable operating leases as of December 31, 2012 (in millions):
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