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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