|**Income Taxes (Tables)**                                                                                                      | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|**Income Tax Disclosure [Abstract]**                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Components of Income Before Income Taxes Table                                                                                 | Components of income (loss) from continuing operations before income taxes are as follows:Year Ended December 31,(millions)201320122011Domestic$202$92$(537)Foreign1,1421,2641,039Total$1,344$1,356$502                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|(millions)                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Domestic                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Components of Income Tax Provision Table                                                                                       | The income tax provision (benefit) from continuing operations consists of the following:Year Ended December 31,(millions)201320122011Current TaxesFederal$21$14$11State112Foreign144143155Total Current166158168Deferred TaxesFederal9660(130)State11(3)Foreign17417255Total Deferred271233(78)Total Income Tax Provision$437$391$90Effective Tax Rate32.5%28.8%17.9%                                                                                                                                                                                                                                                                                                                              
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|(millions)                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Current Taxes                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Federal                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|State                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total Current                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Taxes                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Federal                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|State                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total Deferred                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total Income Tax Provision                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Effective Tax Rate                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Tax Rate Reconciliation Table                                                                                                  | A reconciliation of the federal statutory tax rate to the effective tax rate is as follows:Year Ended December 31,(percentages)201320122011Federal Statutory Rate35.035.035.0Effect ofEarnings of Equity Method Investees(5.3)(4.9)(13.3)State Taxes, Net of Federal Benefit0.10.2(0.1)Difference Between US and Foreign Rates(6.3)(4.9)(7.0)Foreign Exploration Loss2.7(3.8)(4.2)Change in Valuation Allowance3.84.36.6Oil Profits Tax - Israel0.30.92.6Tax Contingency0.41.8—Other, Net1.80.2(1.7)Effective Rate32.528.817.9                                                                                                                                                                     
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|(percentages)                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Federal Statutory Rate                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Effect of                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Earnings of Equity Method Investees                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|State Taxes, Net of Federal Benefit                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Difference Between US and Foreign Rates                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign Exploration Loss                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Change in Valuation Allowance                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Oil Profits Tax - Israel                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Tax Contingency                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Other, Net                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Effective Rate                                                                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Tax Assets and Liabilities                                                                                            | Deferred tax assets and liabilities resulted from the following:December 31,(millions)20132012Deferred Tax AssetsLoss Carryforwards$174$235Employee Compensation & Benefits143134Foreign Tax Credits3138Other5681Total Deferred Tax Assets404488Valuation Allowance - Foreign Loss Carryforwards(135)(81)Valuation Allowance - Foreign Tax Credits(31)(38)Valuation Allowance - Capital Loss Carryforwards(2)—Net Deferred Tax Assets236369Deferred Tax LiabilitiesProperty, Plant and Equipment, Principally Due to Differences in Depreciation, Amortization, Lease Impairment and Abandonments(2,615)(2,481)Total Deferred Tax Liability(2,615)(2,481)Net Deferred Tax Liability$(2,379)$(2,112)
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|(millions)                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Tax Assets                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Loss Carryforwards                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Employee Compensation & Benefits                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Foreign Tax Credits                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Other                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total Deferred Tax Assets                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Valuation Allowance - Foreign Loss Carryforwards                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Valuation Allowance - Foreign Tax Credits                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Valuation Allowance - Capital Loss Carryforwards                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Net Deferred Tax Assets                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Tax Liabilities                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Property, Plant and Equipment, Principally Due to Differences in Depreciation, Amortization, Lease Impairment and Abandonments |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Total Deferred Tax Liability                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Net Deferred Tax Liability                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Tax Liability Balance Sheet Classifcation                                                                             | Net deferred tax liabilities were classified in the consolidated balance sheets as follows:December 31,(millions)20132012Deferred Income Tax Asset - Current$62$106Deferred Income Tax Liability - Noncurrent(2,441)(2,218)Net Deferred Tax Liability$(2,379)$(2,112)                                                                                                                                                                                                                                                                                                                                                                                                                              
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|(millions)                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Income Tax Asset - Current                                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Deferred Income Tax Liability - Noncurrent                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Net Deferred Tax Liability                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]                                                          | A reconciliation of our beginning and ending amounts of unrecognized tax benefits follows:(millions)Twelve Months Ended December 31, 2013Unrecognized Tax Benefits, Beginning Balance$23Additions for tax positions related to current year—Additions for tax positions of prior years7Reductions for tax positions of prior years(2)Settlements—Unrecognized Tax Benefits, Ending Balance$28                                                                                                                                                                                                                                                                                                      
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|(millions)                                                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Unrecognized Tax Benefits, Beginning Balance                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Additions for tax positions related to current year                                                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Additions for tax positions of prior years                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Reductions for tax positions of prior years                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Settlements                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Unrecognized Tax Benefits, Ending Balance                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

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