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Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 17, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]        
Provision for legal contingencies   $ 123 $ 353 $ 234
6.875% Senior Notes Due 2020 [Member] | Senior Notes [Member]        
Loss Contingencies [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   6.875%    
6.125% Senior Notes Due 2021 [Member] | Senior Notes [Member]        
Loss Contingencies [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   6.125%    
8.00% Senior Secured Second Lien Notes Due 2022 [Member] | Senior Notes [Member]        
Loss Contingencies [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   8.00% 8.00%  
Redemption of 2019 Notes [Member] | 6.75% Senior Notes Due 2019 [Member] | Senior Notes [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Damages Awarded, Value $ 380      
Loss Contingency, Prejudgment Interest Awarded $ 59      
Supersedeas Bond   $ 461    
Provision for legal contingencies     $ 339 $ 100