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Investments, Loans and Long-Term Receivables (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]      
Collection of advances/loans—related parties $ 325 $ 325 $ 107
Dakota Access LLC and Energy Transfer Crude Oil Company, LLC      
Schedule of Equity Method Investments [Line Items]      
Collection of advances/loans—related parties 250    
WRB Refining LP      
Schedule of Equity Method Investments [Line Items]      
Collection of advances/loans—related parties $ 75