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Operating Units (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Operating Units [Abstract] |
Schedule of Future Minimum Rental Receipts [Table Text Block] | Consolidated Anticipated Future Receipts The following is a summary of the consolidated anticipated future receipts of the minimum lease payments receivable under the financing and operating method on a consolidated basis at December 31, 2015:
Year |  | Amount
|  | (in millions)
2016 |  | $ | 498 |
2017 |  | 447 |
2018 |  | 367 |
2019 |  | 259 |
2020 |  | 157 |
Thereafter |  | 196 |
|  | $ | 1,924 |

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- Definition Schedule of Future Minimum Rental Receipts [Table Text Block] + References No definition available. + Details
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