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Operations And Organization Accounting Change (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Inventories $ 1,723       $ 1,723   $ 1,532 [1] $ 1,372
Current maturities of long-term debt 21       21   26 [1]  
Cost of products sold 6,376 $ 39,801 $ 9,864 [1] $ 41,603   $ 29,642 [1]    
Operating Income (Loss) 244 7,203 1,856 [1] 5,403   5,541 [1]    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (360) 5,020 1,241 [1] 3,689 (525) 3,728 [1]    
Net income (loss) (401) 4,825 1,187 [1] 3,420 (693) 3,514 [1]    
Less: Net income attributable to noncontrolling interests 369   317 [1]   554 931 [1]    
Comprehensive income (loss) (375) 4,856 1,180 [1] 3,377 (706) 3,516 [1]    
Inventory valuation adjustments (11)   26 [1]   126 (71) [1]    
Increase (Decrease) in Operating Capital   $ (444) 1 $ 234 94 (212) [1]    
Other current assets 235       235   275 [1]  
Property, plant and equipment, net 75,128       75,128   74,193 [1]  
Lease, Right of Use Asset, Net 934       934   964 [1]  
Intangible assets, net 5,915       5,915   6,154 [1]  
Other non-current assets, net 1,582       1,582   1,571 [1] 1,478
Other non-current liabilities 1,152       1,152   1,162 [1]  
Noncontrolling interests 13,007       13,007   12,018 [1]  
Operating expenses 773   806 [1]     2,406 [1]    
Depreciation, depletion and amortization 912   $ 784 [1]   2,715 $ 2,343 [1]    
Non-current operating lease liabilities 901       901   901 [1]  
Long-term debt, less current maturities 51,424       51,424   51,028 [1]  
Operating lease current liabilities 54       54   60 [1]  
Accrued and other current liabilities $ 2,913       $ 2,913   3,342 [1]  
Basic $ (0.29) $ 1.34 $ 0.33 [1] $ 1.20 $ (0.48) $ 0.97 [1]    
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ (756) $ 3,549 $ 851 [1] $ 1,706 $ (1,297) $ 2,547 [1]    
Assets, Current 6,150       6,150   7,464 [1] 6,445
Assets 95,195       95,195   98,973 [1] 88,413
Partners' Capital 18,284       $ 18,284   21,920 [1] 20,726
Previously Reported [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Inventories             1,935 1,677
Cost of products sold   39,727 9,890 41,658   29,607    
Operating Income (Loss)   7,277 1,830 5,348   5,576    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   5,094 1,215 3,634   3,763    
Net income (loss)   4,899 1,161 3,365   3,549    
Comprehensive income (loss)   4,930 1,154 3,322   3,551    
Increase (Decrease) in Operating Capital   $ 518 $ (27) $ (289)   $ 247    
Other non-current assets, net             1,075 1,006
Basic   $ 1.37 $ 0.32 $ 1.16   $ 0.98    
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ 3,623 $ 825 $ 1,651   $ 2,582    
Assets, Current             7,867 6,750
Assets             98,880 88,246
Partners' Capital             21,827 20,559
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Inventories             (403) (305)
Net income (loss) 265              
Other non-current assets, net             496  
Basic         $ 0.10      
Assets, Current             (403)  
Assets             93  
Partners' Capital             $ 93  
Change in Inventory Accounting Policy [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Cost of products sold   74 (26) (55)   35    
Operating Income (Loss)   (74) 26 55   (35)    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   (74) 26 55   (35)    
Net income (loss)   (74) 26 55   (35)    
Comprehensive income (loss)   (74) 26 55   (35)    
Increase (Decrease) in Operating Capital   $ (74) $ 26 $ 55   $ (35)    
Other non-current assets, net               472
Basic   $ (0.03) $ 0.01 $ 0.04   $ (0.01)    
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ (74) $ 26 $ 55   $ (35)    
Assets, Current               (305)
Assets               167
Partners' Capital               $ 167
NGL sales                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue 1,808   1,723 [1]   $ 4,751 6,121 [1]    
Crude sales                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue 2,298   3,971 [1]   7,170 11,842 [1]    
Gathering, transportation and other fees                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue 2,283   2,466 [1]   6,805 6,768 [1]    
Natural gas sales                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue 681   822 [1]   1,783 2,549 [1]    
Other                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Revenue $ 165   $ 202 [1]   $ 459 $ 699 [1]    
[1] *As adjusted. See Note 1.