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Revenue Impact of Adoption (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues and other income:    
Service revenue $ 382 $ 260
Service revenue - related parties 471 255
Service revenue - product related 44 0
Rental income 79 69
Product sales 207 [1] 203
Product sales - related parties 4 2
Costs and expenses:    
Cost of revenues 206 [2] 113
Rental cost of sales 29 12
Purchased product costs 187 131
Depreciation and amortization 176 187
Net income 423 187
Product sales    
Costs and expenses:    
Unrealized gain (loss) 1 $ 7
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Revenues and other income:    
Service revenue 305  
Service revenue - related parties 472  
Service revenue - product related 0  
Rental income 63  
Product sales [1] 228  
Product sales - related parties 3  
Costs and expenses:    
Cost of revenues [2] 128  
Rental cost of sales 13  
Purchased product costs 163  
Depreciation and amortization 176  
Net income 425  
Difference between Revenue Guidance in Effect before and after Topic 606    
Revenues and other income:    
Service revenue 77  
Service revenue - related parties (1)  
Service revenue - product related 44  
Rental income 16  
Product sales [1] (21)  
Product sales - related parties 1  
Costs and expenses:    
Cost of revenues [2] 78  
Rental cost of sales 16  
Purchased product costs 24  
Depreciation and amortization 0  
Net income $ (2)  
[1] G&P “Product sales” exclude approximately $1 million of revenue related to derivative gains/losses and mark-to-market adjustments.
[2] Excludes “Purchased product costs,” “Rental cost of sales,” “Purchases,” “Depreciation and amortization,” “General and administrative expenses,” and “Other taxes.”