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Supplemental Financial Statement Information Supplemental Financial Information (Balance Sheet Units) (Details) - shares | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Authorized | 1,046,947,157 | 1,044,767,336 |  |
Issued | 1,046,947,157 | 1,044,767,336 |  |
Outstanding | 1,046,947,157 | 1,044,767,336 | 1,077,500,000 | 1,119,800,000
Preferred Units, Authorized | 329,299,267 | 0 |  |
Preferred Units, Issued | 329,299,267 | 0 |  |
Preferred Units, Outstanding | 329,299,267 | 0 |  |
Class D Units [Member] |  |  |  |
Authorized | 0 | 2,156,000 |  |
Issued | 0 | 2,156,000 |  |
Outstanding | 0 | 2,156,000 |  |

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