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Revenue Effect of ASC 606 Adoption (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Cost of revenues $ 206 [1] $ 113  
Rental income 79 69  
Rental cost of sales 29 12  
Service revenue - product related 44 0  
Purchased product costs 187 131  
Product sales 207 [2] 203  
Service revenue - related parties 471 255  
Product sales - related parties 4 2  
Service revenue 382 $ 260  
Difference between Revenue Guidance in Effect before and after Topic 606      
Cost of revenues [1] 78    
Rental income 16    
Rental cost of sales 16    
Service revenue - product related 44    
Purchased product costs 24    
Product sales [2] (21)    
Service revenue - related parties (1)    
Product sales - related parties 1    
Service revenue 77    
Difference between Revenue Guidance in Effect before and after Topic 606 | Third Party Reimbursements      
Cost of revenues [1] 78    
Rental income 16    
Rental cost of sales 16    
Service revenue 78    
Difference between Revenue Guidance in Effect before and after Topic 606 | Non-cash Consideration      
Service revenue - product related 11    
Purchased product costs 12    
Difference between Revenue Guidance in Effect before and after Topic 606 | Percent-of-Proceeds      
Service revenue - product related 33    
Product sales (33)    
Difference between Revenue Guidance in Effect before and after Topic 606 | Imbalances      
Purchased product costs 12    
Product sales [2] 12    
Difference between Revenue Guidance in Effect before and after Topic 606 | Oil Allowances      
Product sales [2] 1    
Service revenue - related parties (1)    
Product sales - related parties 1    
Service revenue $ (1)    
ASC 606 | Inventories      
Cumulative effect of new accounting principle in period of adoption     $ 1
ASC 606 | Property, plant and equipment      
Cumulative effect of new accounting principle in period of adoption     $ (3)
[1] Excludes “Purchased product costs,” “Rental cost of sales,” “Purchases,” “Depreciation and amortization,” “General and administrative expenses,” and “Other taxes.”
[2] G&P “Product sales” exclude approximately $1 million of revenue related to derivative gains/losses and mark-to-market adjustments.