|**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 Ended June 30,Six  Months Ended June 30,2012201120122011(millions)Current$56$39$100$36Deferred594810054Total Income Tax Provision$115$87$200$90Effective Tax Rate29%24%28%28%Our effective tax rate for the first six months of 2012 was the same as the first six months of 2011. During the second quarter of 2012, we recognized income tax expense of$13 millionwith respect to a reserve for uncertain tax positions related to prior years.During the six months of 2011, we increased the valuation allowance against our deferred tax asset for foreign tax credits by$14 millionresulting in a corresponding increase in income tax expense.In our major tax jurisdictions, the earliest years remaining open to examination are as follows: US –2008, Equatorial Guinea –2007, Israel –2008, UK –2010, the Netherlands –2009, and China –2006.See Note 3. Acquisitions and Divestitures for income taxes related to discontinued operations.
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|                                     | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|                                     | 2012                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|(millions)                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Current                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Deferred                             | 59                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Total Income Tax Provision           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Effective Tax Rate                   | 29                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

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