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Revenue Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Service revenue $ 382 $ 260
Service revenue - related parties 471 255
Service revenue - product related 44 0
Product sales [1] 206  
Product sales - related parties 4 2
Total revenues from contracts with customers 1,107  
Other income 4 3
Total segment revenues and other income 1,420 886
Income from equity method investments [2] (61) (5)
Other income - related parties (23) (22)
L&S    
Disaggregation of Revenue [Line Items]    
Service revenue 28  
Service revenue - related parties 471  
Service revenue - product related 0  
Product sales [1] 1  
Product sales - related parties 1  
Total revenues from contracts with customers 501  
G&P    
Disaggregation of Revenue [Line Items]    
Service revenue 354  
Service revenue - related parties 0  
Service revenue - product related 44  
Product sales [1] 205  
Product sales - related parties 3  
Total revenues from contracts with customers 606  
Segment Reconciling Items    
Disaggregation of Revenue [Line Items]    
Revenue adjustment from unconsolidated affiliates 137 92
Income from equity method investments (61) (5)
Other income - related parties (13) (11)
Unrealized derivative gains related to product sales [3] (1) (7)
Operating Segments    
Disaggregation of Revenue [Line Items]    
Service revenue 1,215 746
Other income 18 13
Total segment revenues and other income 1,482 955
Operating Segments | L&S    
Disaggregation of Revenue [Line Items]    
Service revenue 646 345
Other income 12 12
Total segment revenues and other income 658 357
Operating Segments | G&P    
Disaggregation of Revenue [Line Items]    
Service revenue 569 401
Other income 6 1
Total segment revenues and other income 824 598
Product sales    
Disaggregation of Revenue [Line Items]    
Unrealized gain (loss) 1 $ 7
Other Income [Member]    
Disaggregation of Revenue [Line Items]    
Other income [4] $ 313  
[1] G&P “Product sales” exclude approximately $1 million of revenue related to derivative gains/losses and mark-to-market adjustments.
[2] “Income (loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[3] The Partnership makes a distinction between realized or unrealized gains and losses on derivatives. During the period when a derivative contract is outstanding, changes in the fair value of the derivative are recorded as an unrealized gain or loss. When a derivative contract matures or is settled, the previously recorded unrealized gain or loss is reversed and the realized gain or loss of the contract is recorded
[4] Non-ASC 606 Revenue includes rental income, income from equity method investments, derivative gains/losses, mark-to-market adjustments, and other income.