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Operating Units Other Segments and Other Information (Details) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 Real Estate Segment [Member] real_estate_properties | Dec. 31, 2012 Real Estate Segment [Member] | Dec. 31, 2013 Viskase [Member] distribution_centers manufacturing_facilities | Dec. 31, 2013 ARI [Member] | Dec. 31, 2013 MASSACHUSETTS Real Estate Segment [Member] real_estate_property_units | Dec. 31, 2013 FLORIDA Real Estate Segment [Member] real_estate_property_units | Dec. 31, 2013 Las Vegas, Nevada [Member] [Member] Real Estate Segment [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in subsidiary |  |  |  | 73.50% | 55.60% |  |  |
Number of manufacturing facilities |  |  |  | 9 |  |  |  |
Number of distribution centers |  |  |  | 10 |  |  |  |
Percentage of revenues from foreign countries |  |  |  | 70.00% |  |  |  |
Number of Real Estate Properties |  | 29 |  |  |  |  |  |
Number of residential units for future development |  |  |  |  |  | 271 | 1,325 |
Acres of land |  |  |  |  |  |  |  | 23
Real estate assets pledged to collateralize mortgages |  | $ 56 | $ 73 |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable, Due in 2014 | 434 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable, Due in 2015 | 353 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable, Due in 2016 | 311 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable, Due in 2017 | 264 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable, Due in 2018 | 189 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable, Thereafter | 216 |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments Receivable | $ 1,767 |  |  |  |  |  |  |

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