Reportable Segments (Revenue from external customers for the Company's consolidated reportable segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 416	$ 482
Total service revenue
Segment Reporting Information [Line Items]
Total revenue	356	418
Terminal services
Segment Reporting Information [Line Items]
Total revenue	37	24
Lease
Segment Reporting Information [Line Items]
Total revenue	93	134
Fuel
Segment Reporting Information [Line Items]
Total revenue	150	181
Hangar
Segment Reporting Information [Line Items]
Total revenue	25	23
Other
Segment Reporting Information [Line Items]
Total revenue	51	56
Total product revenue
Segment Reporting Information [Line Items]
Total revenue	60	64
Lease
Segment Reporting Information [Line Items]
Total revenue	1	1
Gas
Segment Reporting Information [Line Items]
Total revenue	57	60
Other
Segment Reporting Information [Line Items]
Total revenue	2	3
Operating Segments | IMTT
Segment Reporting Information [Line Items]
Total revenue	132	161
Operating Segments | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	224	258
Operating Segments | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	60	64
Operating Segments | Total service revenue | IMTT
Segment Reporting Information [Line Items]
Total revenue	132	161
Operating Segments | Total service revenue | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	224	258
Operating Segments | Total service revenue | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Terminal services | IMTT
Segment Reporting Information [Line Items]
Total revenue	37	24
Operating Segments | Terminal services | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Terminal services | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Lease | IMTT
Segment Reporting Information [Line Items]
Total revenue	93	135
Operating Segments | Lease | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Lease | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Fuel | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Fuel | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	150	181
Operating Segments | Fuel | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Hangar | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Hangar | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	25	23
Operating Segments | Hangar | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Other | IMTT
Segment Reporting Information [Line Items]
Total revenue	2	2
Operating Segments | Other | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	49	54
Operating Segments | Other | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Total product revenue | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Total product revenue | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Total product revenue | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	60	64
Operating Segments | Lease | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Lease | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Lease | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	1	1
Operating Segments | Gas | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Gas | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Gas | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	57	60
Operating Segments | Other | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Other | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0
Operating Segments | Other | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	$ 2	3
Intercompany Adjustments
Segment Reporting Information [Line Items]
Total revenue		(1)
Intercompany Adjustments | Total service revenue
Segment Reporting Information [Line Items]
Total revenue		(1)
Intercompany Adjustments | Terminal services
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Lease
Segment Reporting Information [Line Items]
Total revenue		(1)
Intercompany Adjustments | Fuel
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Hangar
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Other
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Total product revenue
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Lease
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Gas
Segment Reporting Information [Line Items]
Total revenue		0
Intercompany Adjustments | Other
Segment Reporting Information [Line Items]
Total revenue		$ 0