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Segment Disclosures and Related Information (Summary of Investments In and Advances to Affiliates, Total Assets, Capital Expenditures and Investments, Interest Income and Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Analysis of results of investments in and advances to affiliates by operating segment      
Investments In and Advances To Affiliates $ 13,354 $ 11,980 $ 10,038
Analysis of results of total assets by operating segment      
Total Assets 51,653 48,580 48,692
Capital Expenditures and Investments      
Capital Expenditures and Investments 2,844 5,764 3,773
Interest Income and Expense      
Interest income 18 27 21
Interest and debt expense 338 310 267
Midstream      
Analysis of results of investments in and advances to affiliates by operating segment      
Investments In and Advances To Affiliates 4,769 4,198 2,461
Analysis of results of total assets by operating segment      
Total Assets 12,832 11,043 7,295
Capital Expenditures and Investments      
Capital Expenditures and Investments 1,453 4,457 2,173
Interest Income and Expense      
Interest income 2    
Chemicals      
Analysis of results of investments in and advances to affiliates by operating segment      
Investments In and Advances To Affiliates 5,773 5,177 5,183
Analysis of results of total assets by operating segment      
Total Assets 5,802 5,237 5,209
Capital Expenditures and Investments      
Capital Expenditures and Investments 0 0 0
Refining      
Analysis of results of investments in and advances to affiliates by operating segment      
Investments In and Advances To Affiliates 2,420 2,262 2,103
Analysis of results of total assets by operating segment      
Total Assets 22,825 21,993 22,808
Capital Expenditures and Investments      
Capital Expenditures and Investments 1,149 1,069 1,038
Marketing and Specialties      
Analysis of results of investments in and advances to affiliates by operating segment      
Investments In and Advances To Affiliates 391 342 290
Analysis of results of total assets by operating segment      
Total Assets 6,227 5,631 7,051
Capital Expenditures and Investments      
Capital Expenditures and Investments 98 122 439
Interest Income and Expense      
Interest income 0 2 0
Corporate and Other      
Analysis of results of investments in and advances to affiliates by operating segment      
Investments In and Advances To Affiliates 1 1 1
Analysis of results of total assets by operating segment      
Total Assets 3,967 4,676 6,329
Capital Expenditures and Investments      
Capital Expenditures and Investments 144 116 123
Interest Income and Expense      
Interest income 16 25 21
Interest and debt expense $ 338 $ 310 $ 267