| **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, 2013 2012(millions)   Current$36 $44Deferred50 42Total Income Tax Provision$86 $86Effective Tax Rate27.1% 25.8%Our effective tax rate for the first three months of 2013 increased as compared with the first three months of 2012. This increase is primarily due to a tax contingency recognized during the first quarter of 2013.In our major tax jurisdictions, the earliest years remaining open to examination are as follows: US – 2008, Equatorial Guinea – 2007, Israel – 2008 and China –2010.See Note 3. Divestitures for income taxes related to discontinued operations. |

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| - Definition
The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.
+ References
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