Loss Contingency, Number of Putative Class Action Lawsuits

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Loss Contingency, Prejudgment Interest Awarded

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Supersedeas Bond

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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Amount of damages awarded to the plaintiff in the legal matter.

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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Contingencies - Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended
Contingencies - Narrative (Details) $ in Millions	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%