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Contingencies - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 17, 2015	Jul. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Provision for legal contingencies			$ 8	$ 0	$ 112	$ 359
6.875% Senior Notes Due 2020 [Member] | Senior Notes [Member]
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.875%		6.875%
6.125% Senior Notes Due 2021 [Member] | Senior Notes [Member]
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.125%		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
MDL [Member]
Loss Contingencies [Line Items]
Percentage of hydrocarbons					97.00%
Payments for Legal Settlements					$ 29
Promissory Note, Legal Settlement		$ 10
Term for Promissory Note		3 years

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Loss Contingency, Prejudgment Interest Awarded

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Promissory Note, Legal Settlement

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Supersedeas Bond

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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