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Estimates, Significant Accounting Policies and Balance Sheet Detail Estimates (Schedule of Accounting Change) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Other current assets $ 213       $ 275       $ 213 $ 275  
Increase (Decrease) in Operating Capital                 47 (391) $ 234
Inventories 1,739       1,532       1,739 1,532  
Noncontrolling interests 12,859       12,018       12,859 12,018  
Property, Plant and Equipment, Net 75,107       74,193       75,107 74,193  
Intangible assets, net 5,746       6,154       5,746 6,154  
Other non-current assets, net 1,657       1,571       1,657 1,571  
Other non-current liabilities 1,152       1,162       1,152 1,162  
Cost of Goods and Services Sold                 25,487 39,801 41,603
Operating expenses                 3,218 3,294 3,089
Depreciation, depletion and amortization                 3,678 3,147 2,859
Operating Lease, Right-of-Use Asset 1,000       964       1,000 964  
Operating Lease, Liability, Current 53       60       53 60  
Accrued and other current liabilities 2,775       3,342       2,775 3,342  
Current maturities of long-term debt 21       26       21 26  
Long-term debt, less current maturities 51,417       51,028       51,417 51,028  
Operating Lease, Liability, Noncurrent 837       901       837 901  
Assets, Current 6,317       7,464       6,317 7,464  
Assets 95,144       98,973       95,144 98,973 88,413
Partners' Capital 18,529       21,920       18,529 21,920  
Operating income 1,339 $ 244 $ 1,336 $ 61 1,627 $ 1,830 $ 1,819 $ 1,927 2,980 7,203 5,403
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                 377 5,020 3,689
Net income $ 833 $ (401) $ 672 $ (964) $ 1,276 $ 1,161 $ 1,208 $ 1,180 $ 140 $ 4,825 $ 3,420
Basic $ 0.19 $ (0.24) $ 0.13 $ (0.32) $ 0.37 $ 0.33 $ 0.33 $ 0.31 $ (0.24) $ 1.34 $ 1.20
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest                 $ 155 $ 4,856 $ 3,377
Comprehensive Income (Loss), Net of Tax, Attributable to Parent                 $ (633) 3,549 1,706
Previously Reported [Member]                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Increase (Decrease) in Operating Capital                   465 (289)
Inventories         $ 1,935         1,935  
Other non-current assets, net         1,075         1,075  
Cost of Goods and Services Sold                   39,727 41,658
Assets, Current         7,867         7,867  
Assets         98,880         98,880  
Partners' Capital         21,827         21,827  
Operating income                   7,277 5,348
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                   5,094 3,634
Net income                   $ 4,899 $ 3,365
Basic                   $ 1.37 $ 1.16
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest                   $ 4,930 $ 3,322
Comprehensive Income (Loss), Net of Tax, Attributable to Parent                   3,623 1,651
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Increase (Decrease) in Operating Capital                   (74) 55
Inventories         (403)         (403)  
Other non-current assets, net         496         496  
Cost of Goods and Services Sold                   74 (55)
Assets, Current         (403)         (403)  
Assets         93         93  
Partners' Capital         $ 93         93  
Operating income                   (74) 55
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                   (74) 55
Net income                   $ (74) $ 55
Basic                   $ (0.03) $ 0.04
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest                   $ (74) $ 55
Comprehensive Income (Loss), Net of Tax, Attributable to Parent                   $ (74) $ 55