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Estimates, Significant Accounting Policies and Balance Sheet Detail Estimates (Schedule of Accounting Change) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Other current assets $ 275 $ 350    
Increase (Decrease) in Operating Capital (518) 289 $ (192)  
Inventories 1,935 1,677    
Noncontrolling interests 12,018 10,291    
Property, Plant and Equipment, Net 74,193 66,963   $ 66,962
Intangible assets, net 6,154 6,000    
Other non-current assets, net 1,075 1,006    
Other non-current liabilities 1,162 1,184   1,172
Cost of Goods and Services Sold 39,727 41,658 30,966  
Operating expenses 3,294 3,089 2,644  
Depreciation, depletion and amortization 3,147 2,859 2,554  
Operating Lease, Right-of-Use Asset 1,000 0   889
Operating Lease, Liability, Current 60 0   71
Accrued and other current liabilities 3,342 2,918   2,917
Current maturities of long-term debt 26 2,655   2,656
Long-term debt, less current maturities 51,028 43,373   43,379
Operating Lease, Liability, Noncurrent 901 0   823
Natural gas sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 3,295 4,452 4,172  
NGL sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 8,290 9,986 7,781  
Crude sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 15,917 14,425 10,706  
Gathering, transportation and other fees        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 9,086 6,797 4,435  
Refined product sales        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 16,752 17,458 11,166  
Other        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 873 $ 969 $ 2,263  
Accounting Standards Update 2016-02 [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Property, Plant and Equipment, Net       (1)
Other non-current liabilities       (12)
Operating Lease, Right-of-Use Asset       889
Operating Lease, Liability, Current       71
Accrued and other current liabilities       (1)
Current maturities of long-term debt       1
Long-term debt, less current maturities       6
Operating Lease, Liability, Noncurrent       $ 823