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Operations And Organization Accounting Change (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of products sold $ 9,245 $ 7,510    
Operating Income (Loss) 1,100 757    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 716 368    
Net income 489 319    
Less: Net income attributable to noncontrolling interest 126 80    
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 490 319    
Inventory, LIFO Reserve, Effect on Income, Net   13    
Increase (Decrease) in Operating Capital 757 (185)    
Other current assets 304   $ 303 $ 295
Property, plant and equipment, net 61,975   61,088 61,088
Intangible assets, net 5,936   6,016 6,116
Other non-current assets, net 936   925 886
Other non-current liabilities 1,244   1,218 1,217
Total equity 29,481     29,980
Natural gas sales 1,062 1,012    
NGL sales 2,030 1,546    
Crude sales 3,254 2,542    
Gathering, transportation and other fees 1,430 1,065    
Refined product sales 3,810 3,015    
Other 296 481    
Operating expenses 724 601    
Depreciation and amortization 665 628    
Noncontrolling interest 30,661     31,176
Scenario, Previously Reported [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of products sold 9,433 7,539 [1]    
Operating Income (Loss) [1]   728    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest [1]   339    
Net income [1]   290    
Less: Net income attributable to noncontrolling interest [1]   51    
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [1]   290    
Inventory, LIFO Reserve, Effect on Income, Net [1]   11    
Increase (Decrease) in Operating Capital [1]   154    
Other current assets 295      
Property, plant and equipment, net 61,975     61,088
Intangible assets, net 6,041      
Other non-current assets, net 894      
Other non-current liabilities 1,243      
Total equity       31,176
Natural gas sales 1,062      
NGL sales 2,019      
Crude sales 3,254      
Gathering, transportation and other fees 1,617      
Refined product sales 3,820      
Other 296      
Operating expenses 715      
Depreciation and amortization 671      
Noncontrolling interest 30,716      
Restatement Adjustment [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Cost of products sold (188) (29)    
Operating Income (Loss)   29    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   29    
Net income   29    
Less: Net income attributable to noncontrolling interest   29    
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest   29    
Inventory, LIFO Reserve, Effect on Income, Net   2    
Increase (Decrease) in Operating Capital   $ 31    
Other current assets 9     8
Property, plant and equipment, net 0     0
Intangible assets, net (105)     (100)
Other non-current assets, net 42     39
Other non-current liabilities 1     1
Total equity       $ (54)
Natural gas sales 0      
NGL sales 11      
Crude sales 0      
Gathering, transportation and other fees (187)      
Refined product sales (10)      
Other 0      
Operating expenses 9      
Depreciation and amortization (6)      
Noncontrolling interest (55)      
Noncontrolling Interest        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net income 126      
Total equity $ 30,661   $ 31,122  
[1] * Amounts reflect certain reclassifications made to conform to the current year presentation and include the impact of discontinued operations as discussed in Note 2.