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Operations And Organization Accounting Change (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Cost of products sold $ 11,093 $ 7,341 [1] $ 31,681 $ 22,018 [1]      
Operating Income (Loss) 1,703 931 [1] 3,929 2,431 [1]      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,341 584 [1] 2,784 1,299 [1]      
Net income, excluding amounts attributable to redeemable noncontrolling interests 1,391 758 [1] 2,513 1,198 [1]      
Less: Net income attributable to noncontrolling interest 1,008 506 [1] 1,412 495 [1]      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 1,395 765 [1] 2,520 1,204 [1]      
Inventory valuation adjustments 7 (50) [1] (50) (8) [1]      
Increase (Decrease) in Operating Capital     423 192 [1]      
Other current assets 303   303     $ 303 $ 295
Property, plant and equipment, net 65,643   65,643     61,088 61,088
Intangible assets, net 6,013   6,013     6,016 6,116
Other non-current assets, net 1,106   1,106     925 886
Other non-current liabilities 1,253   1,253     1,218 1,217
Noncontrolling interest 32,136   32,136       31,176
Operating expenses 784 918 [1] 2,280 2,167 [1]      
Depreciation, depletion and amortization 750 642 [1] 2,109 1,877 [1]      
Noncontrolling Interest              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Noncontrolling interest           $ 31,122  
Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Cost of products sold (205) 46 (540) 13      
Operating Income (Loss)   (46)   (13)      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   (46)   (13)      
Net income, excluding amounts attributable to redeemable noncontrolling interests   (46)   (13)      
Less: Net income attributable to noncontrolling interest   (46)   (13)      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest   (46)   (13)      
Inventory valuation adjustments       30      
Increase (Decrease) in Operating Capital       (17)      
Other current assets         $ 11   8
Property, plant and equipment, net         0   0
Intangible assets, net         (122)   (100)
Other non-current assets, net         51   39
Other non-current liabilities         1   1
Noncontrolling interest         (61)   (54)
Operating expenses 11   32        
Depreciation, depletion and amortization (8)   (21)        
Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Cost of products sold 11,298 7,295 [2] 32,221 22,005 [2]      
Operating Income (Loss) [2]   977   2,444      
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest [2]   630   1,312      
Net income, excluding amounts attributable to redeemable noncontrolling interests [2]   804   1,211      
Less: Net income attributable to noncontrolling interest [2]   552   508      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [2]   811   1,217      
Inventory valuation adjustments [2]       (38)      
Increase (Decrease) in Operating Capital [2]       209      
Other current assets         292    
Property, plant and equipment, net         65,643   $ 61,088
Intangible assets, net         6,135    
Other non-current assets, net         1,055    
Other non-current liabilities         1,252    
Noncontrolling interest         $ 32,197    
Operating expenses 773   2,248        
Depreciation, depletion and amortization 758   2,130        
Natural gas sales [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,026 1,098 [1] 3,112 3,132 [1]      
Natural gas sales [Member] | Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0        
Natural gas sales [Member] | Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,026   3,112        
NGL sales [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 2,695 1,749 [1] 6,866 4,782 [1]      
NGL sales [Member] | Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 9   27        
NGL sales [Member] | Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 2,686   6,839        
Oil and Gas [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 3,841 2,381 [1] 11,336 7,268 [1]      
Oil and Gas [Member] | Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 3   10        
Oil and Gas [Member] | Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 3,838   11,326        
Natural Gas, Midstream [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,781 1,068 [1] 4,878 3,244 [1]      
Natural Gas, Midstream [Member] | Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (204)   (537)        
Natural Gas, Midstream [Member] | Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,985   5,415        
Oil and Gas, Refining and Marketing [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 4,955 3,080 [1] 13,583 8,998 [1]      
Oil and Gas, Refining and Marketing [Member] | Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (13)   (36)        
Oil and Gas, Refining and Marketing [Member] | Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 4,968   13,619        
Product and Service, Other [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 216 $ 608 [1] 739 $ 1,648 [1]      
Product and Service, Other [Member] | Restatement Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0        
Product and Service, Other [Member] | Previously Reported [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax $ 216   $ 739        
[1] As adjusted. See Note 1.
[2] * Amounts reflect certain reclassifications made to conform to the current year presentation and include the impact of discontinued operations as discussed in Note 2.