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Revenues - Performance Obligations (Details)
$ in Millions
Mar. 31, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 404
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 505
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 501
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 426
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 380
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 1,361
Pipeline revenues supported by minimum volume commitments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 77
Pipeline revenues supported by minimum volume commitments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 158
Pipeline revenues supported by minimum volume commitments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 225
Pipeline revenues supported by minimum volume commitments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 214
Pipeline revenues supported by minimum volume commitments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 212
Pipeline revenues supported by minimum volume commitments | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 682
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 327
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 347
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 276
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 212
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 168
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 679