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Revenues and Accounts Receivable - Performance Obligations (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 447
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 573
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 461
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 387
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 353
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 1,041
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 136
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 223
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 213
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 209
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 208
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 648
Long-term storage, terminalling and throughput agreement revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 311
Long-term storage, terminalling and throughput agreement 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 350
Long-term storage, terminalling and throughput agreement 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 248
Long-term storage, terminalling and throughput agreement 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 178
Long-term storage, terminalling and throughput agreement 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 145
Long-term storage, terminalling and throughput agreement revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 393