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Revenues and Accounts Receivable - Performance Obligations (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 568
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 482
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 412
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 356
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 293
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 1,064
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 $ 164
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 170
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 170
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 168
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 146
Remaining performance obligation, expected timing of satisfaction, period 1 year
Pipeline revenues supported by minimum volume commitments and long-term capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 698
Remaining performance obligation, expected timing of satisfaction, period
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 $ 404
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 312
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 242
Remaining performance obligation, expected timing of satisfaction, period 1 year
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 $ 188
Remaining performance obligation, expected timing of satisfaction, period 1 year
Long-term storage, terminalling and throughput agreements 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 $ 147
Remaining performance obligation, expected timing of satisfaction, period 1 year
Long-term storage, terminalling and throughput agreements revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 366
Remaining performance obligation, expected timing of satisfaction, period