|**Income Taxes**                     | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
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|**Income Tax Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Income Taxes                         | Income TaxesThe income tax provision relating to continuing operations consists of the following:Three Months EndedMarch 31,(millions)20152014Current$10$60Deferred(30)17Total Income Tax (Benefit) Provision$(20)$77Effective Tax Rate47.6%27.6%Our effective tax rate (ETR) for thethreemonths endedMarch 31, 2015increased as compared with thethreemonths endedMarch 31, 2014primarily as a result of a tax benefit divided by a pre-tax loss. In the case of a pre-tax loss, our favorable permanent differences, such as income from equity method investees and increased earnings in our foreign jurisdictions with rates that vary from the US statutory rate, have the effect of increasing the tax benefit which, in turn, increases the ETR.In our major tax jurisdictions, the earliest years remaining open to examination are as follows: US –2011, Equatorial Guinea –2009and Israel –2010.
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|                                     | Three Months EndedMarch 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|(millions)                           | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Current                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Deferred                             | (30                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Total Income Tax (Benefit) Provision | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Effective Tax Rate                   | 47.6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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