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Contingencies - Narrative (Details) - Redemption of 2019 Notes [Member] - Senior Notes [Member] - 6.75% Senior Notes Due 2019 [Member] - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 17, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2017
Loss Contingencies [Line Items] |  |  |  |
Supersedeas Bond |  |  |  | $ 461
Provision for Legal Contingencies |  | $ 339 | $ 100 |
Judicial Ruling [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Damages Awarded | $ 380 |  |  |
Loss Contingency, Interest Awarded | $ 59 |  |  |

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