Reportable Segments (Revenue from external customers for the Company's consolidated reportable segments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 405	$ 421	$ 1,303	$ 1,324
Total service revenue
Segment Reporting Information [Line Items]
Total revenue	347	361	1,120	1,140
Terminal services
Segment Reporting Information [Line Items]
Total revenue	22	19	68	66
Lease
Segment Reporting Information [Line Items]
Total revenue	95	97	324	301
Fuel
Segment Reporting Information [Line Items]
Total revenue	165	173	519	524
Hangar
Segment Reporting Information [Line Items]
Total revenue	24	22	70	66
Construction
Segment Reporting Information [Line Items]
Total revenue		8		39
Other
Segment Reporting Information [Line Items]
Total revenue	41	42	139	144
Total product revenue
Segment Reporting Information [Line Items]
Total revenue	58	60	183	184
Lease
Segment Reporting Information [Line Items]
Total revenue	2	1	4	3
Gas
Segment Reporting Information [Line Items]
Total revenue	54	55	171	172
Other
Segment Reporting Information [Line Items]
Total revenue	2	4	8	9
Operating Segments | IMTT
Segment Reporting Information [Line Items]
Total revenue	118	118	398	386
Operating Segments | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	230	235	724	715
Operating Segments | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	58	69	183	226
Operating Segments | Total service revenue | IMTT
Segment Reporting Information [Line Items]
Total revenue	118	118	398	386
Operating Segments | Total service revenue | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	230	235	724	715
Operating Segments | Total service revenue | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	9	0	42
Operating Segments | Terminal services | IMTT
Segment Reporting Information [Line Items]
Total revenue	22	19	68	66
Operating Segments | Terminal services | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Terminal services | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Lease | IMTT
Segment Reporting Information [Line Items]
Total revenue	96	98	326	304
Operating Segments | Lease | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Lease | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Fuel | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Fuel | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	165	173	519	524
Operating Segments | Fuel | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Hangar | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Hangar | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	24	22	70	66
Operating Segments | Hangar | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Construction | IMTT
Segment Reporting Information [Line Items]
Total revenue		0		0
Operating Segments | Construction | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue		0		0
Operating Segments | Construction | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue		8		39
Operating Segments | Other | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	1	4	16
Operating Segments | Other | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	41	40	135	125
Operating Segments | Other | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	0	1	0	3
Operating Segments | Total product revenue | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Total product revenue | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Total product revenue | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	58	60	183	184
Operating Segments | Lease | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Lease | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Lease | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	2	1	4	3
Operating Segments | Gas | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Gas | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Gas | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	54	55	171	172
Operating Segments | Other | IMTT
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Other | Atlantic Aviation
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Operating Segments | Other | MIC Hawaii
Segment Reporting Information [Line Items]
Total revenue	2	4	8	9
Intercompany Adjustments
Segment Reporting Information [Line Items]
Total revenue	(1)	(1)	(2)	(3)
Intercompany Adjustments | Total service revenue
Segment Reporting Information [Line Items]
Total revenue	(1)	(1)	(2)	(3)
Intercompany Adjustments | Terminal services
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Lease
Segment Reporting Information [Line Items]
Total revenue	(1)	(1)	(2)	(3)
Intercompany Adjustments | Fuel
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Hangar
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Construction
Segment Reporting Information [Line Items]
Total revenue		0		0
Intercompany Adjustments | Other
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Total product revenue
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Lease
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Gas
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Intercompany Adjustments | Other
Segment Reporting Information [Line Items]
Total revenue	$ 0	$ 0	$ 0	$ 0