Other Contingencies and Commitments (Details)	Nov. 07, 2011 bbl	Aug. 27, 2015 Employee	Mar. 14, 2012 Employee	Dec. 31, 2009 USD ($)
Loss Contingencies [Line Items]
Indemnifications acquirer environmental liabilities max obligation | $				$ 200,000,000
Number of employees charged			11
Dismissal of charges, number of employees		11
Brazil
Loss Contingencies [Line Items]
Emitted of barrels of oil | bbl	2,400