|**Income Taxes**                     | 6 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 EndedJune 30,Six Months EndedJune 30,(millions)2014201320142013Current$34$71$94$108Deferred75724106Total Income Tax Provision$41$128$118$214Effective Tax Rate17.6%26.4%23.1%26.6%Our effective tax rate (ETR) for the three months andsixmonths endedJune 30, 2014decreased as compared with the three andsixmonths endedJune 30, 2013primarily due to our ability to benefit from previously unrecognized foreign tax credits, increased earnings in our foreign jurisdictions with rates that vary from the US statutory rate and a decrease in our Israeli oil profits tax.In our major tax jurisdictions, the earliest years remaining open to examination are as follows: US –2010, Equatorial Guinea –2008and Israel –2009.See Note3. Divestituresfor income taxes associated with discontinued operations.
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|                                     | Three Months EndedJune 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|(millions)                           | 2014                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Current                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Deferred                             | 7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Total Income Tax Provision           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Effective Tax Rate                   | 17.6                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

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