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Summary of Significant Accounting Policies Effect of change related to ASU 2014-09 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenues $ 3,749    
Depreciation, amortization and accretion (49)    
Other current assets 71 $ 89 $ 81
Property and equipment, net 1,522 1,557 1,557
Intangible assets, net (656) (668) (768)
Other noncurrent assets 91 84 45
Other noncurrent liabilities 137 126 125
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Sales Revenue From Wholesale Fuel Sales To Third Parties (10)    
Other 0    
Other (1)    
Other operating (2)    
Depreciation, amortization and accretion (6)    
Other current assets 9    
Property and equipment, net 0    
Intangible assets, net (105)    
Other noncurrent assets 42    
Other noncurrent liabilities 1    
Total partners' capital (55)    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Sales Revenue From Wholesale Fuel Sales To Third Parties 3,104    
Other 41    
Other (15)    
Other operating (100)    
Depreciation, amortization and accretion (55)    
Other current assets 62    
Property and equipment, net 1,522    
Intangible assets, net (761)    
Other noncurrent assets 49    
Other noncurrent liabilities 136    
Total partners' capital 987    
Common Units      
Total partners' capital $ 932 $ 1,893 $ 1,947