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Contingencies - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 17, 2015 USD ($) | Mar. 31, 2016 USD ($) Lawsuit | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Provision for legal contingencies |  | $ 22 | $ 25 |  |
Loss Contingency, Number of Putative Class Action Lawsuits | Lawsuit |  | 3 |  |  |
6.75% Senior Notes Due 2019 [Member] | Senior Notes [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Supersedeas Bond |  | $ 461 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.775% |  |  |
6.75% Senior Notes Due 2019 [Member] | Senior Notes [Member] | Redemption of 2019 Notes [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 380 |  |  |  |
Loss Contingency, Prejudgment Interest Awarded | $ 59 |  |  |  |
Provision for legal contingencies |  |  |  | $ 339 | $ 100
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% |  |  |

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