Long-Term Contracted Revenue (Details) $ in Millions	Jun. 30, 2019 USD ($)
Lease Revenue (ASC 842)
2019 remaining	$ 23
2020	45
2021	43
2022	42
2023	41
Thereafter	538
Total lease payment	732
Total Long-Term Revenue
2019 remaining	186
2020	227
2021	130
2022	87
2023	56
Thereafter	121
Total	807
Accounting Standards Update 2016-02
Lease Revenue (ASC 842)
2019 remaining	149
2020	183
2021	100
2022	62
2023	38
Thereafter	103
Total lease payment	635
Accounting Standards Update 2014-09
Contract Revenue (ASC 606)
2019 remaining	37
2020	44
2021	30
2022	25
2023	18
Thereafter	18
Total	$ 172