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Revenues and Accounts Receivable - Performance Obligations (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 410
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 473
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 391
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 325
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 242
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation 788
Pipeline revenues supported by minimum volume commitments and capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 135
Remaining performance obligations, expected timing of satisfaction, period 1 year
Pipeline revenues supported by minimum volume commitments and 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 $ 171
Remaining performance obligations, expected timing of satisfaction, period 1 year
Pipeline revenues supported by minimum volume commitments and 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 $ 171
Remaining performance obligations, expected timing of satisfaction, period 1 year
Pipeline revenues supported by minimum volume commitments and 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 obligations, expected timing of satisfaction, period 1 year
Pipeline revenues supported by minimum volume commitments and 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 $ 126
Remaining performance obligations, expected timing of satisfaction, period 1 year
Pipeline revenues supported by minimum volume commitments and capacity agreements | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 456
Remaining performance obligations, expected timing of satisfaction, period
Storage, terminalling and throughput agreement revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 275
Remaining performance obligations, expected timing of satisfaction, period 1 year
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 $ 302
Remaining performance obligations, expected timing of satisfaction, period 1 year
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 $ 220
Remaining performance obligations, expected timing of satisfaction, period 1 year
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 $ 179
Remaining performance obligations, expected timing of satisfaction, period 1 year
Storage, terminalling and throughput agreement 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 $ 116
Remaining performance obligations, expected timing of satisfaction, period 1 year
Storage, terminalling and throughput agreement revenues | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction  
Remaining performance obligation $ 332
Remaining performance obligations, expected timing of satisfaction, period