| **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, 2013 2012 2013 2012(millions)       Current$71 $56 $108 $100Deferred57 59 106 100Total Income Tax Provision$128 $115 $214 $200Effective Tax Rate26.4% 29.5% 26.6% 27.6%Our effective tax rate for the first six months of 2013 decreased as compared with the first six months of 2012. This decrease is primarily due to a tax contingency recognized during the second quarter of 2012.In our major tax jurisdictions, the earliest years remaining open to examination are as follows: US – 2008, Equatorial Guinea – 2008, Israel – 2008 and China –2010.See Note3. Divestitures for income taxes associated with 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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