Revenues from Contracts with Customers (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) bcf / d item	Sep. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
LNG Volume, Purchase Price Percentage of Henry Hub			115.00%
Regasification Capacity | bcf / d			4.0
Operating and maintenance expense | $	$ 113.0	$ 73.0	$ 306.0	$ 205.0
TUA Customers [Member]
Disaggregation of Revenue [Line Items]
Regasification Capacity | bcf / d			2.0
Number Of Fixed Price Contracts | item			2
TUA Customer 1 [Member]
Disaggregation of Revenue [Line Items]
Regasification Capacity | bcf / d			1.0
Revenue, Performance Obligation, Fixed Consideration | $			$ 125.0
Long-term Purchase Commitment, Period			20 years
TUA Customer 2 [Member]
Disaggregation of Revenue [Line Items]
Regasification Capacity | bcf / d			1.0
Revenue, Performance Obligation, Fixed Consideration | $			$ 125.0
Long-term Purchase Commitment, Period			20 years
LNG [Member]
Disaggregation of Revenue [Line Items]
Revenue, Variable Consideration Received From Customers, Percentage	55.00%		55.00%
LNG—affiliate [Member]
Disaggregation of Revenue [Line Items]
Revenue, Variable Consideration Received From Customers, Percentage	100.00%		100.00%
Regasification [Member]
Disaggregation of Revenue [Line Items]
Revenue, Variable Consideration Received From Customers, Percentage	3.00%		3.00%
Partial TUA Regasification Capacity [Member]
Disaggregation of Revenue [Line Items]
Operating and maintenance expense | $	$ 7.5	$ 7.5	$ 23.0	$ 15.0