Quarterly report pursuant to Section 13 or 15(d)

Transportation and Distribution Revenue - Schedules of Concentration of Risk (Details)

v3.20.2
Transportation and Distribution Revenue - Schedules of Concentration of Risk (Details) - Product and services - Revenue
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Natural gas transportation contracts        
Concentration Risk [Line Items]        
Concentration percentage 64.60% 52.70% 67.20% 57.50%
Natural gas distribution contracts        
Concentration Risk [Line Items]        
Concentration percentage 26.00% 39.20% 25.30% 36.20%