Reportable Segments (Revenue from external customers for the Company's consolidated reportable segments) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 424	$ 405	$ 416	$ 482	$ 437	$ 421	$ 436	$ 467	$ 1,727	$ 1,761	$ 1,669
Total service revenue
Segment Reporting Information [Line Items]
Revenue									1,484	1,515	1,446
Terminal services
Segment Reporting Information [Line Items]
Revenue									90	89	85
Lease
Segment Reporting Information [Line Items]
Revenue									416	398	426
Fuel
Segment Reporting Information [Line Items]
Revenue									695	704	615
Hangar
Segment Reporting Information [Line Items]
Revenue									95	88	78
Construction
Segment Reporting Information [Line Items]
Revenue										43	54
Other
Segment Reporting Information [Line Items]
Revenue									188	193	188
Total product revenue
Segment Reporting Information [Line Items]
Revenue									243	246	223
Lease
Segment Reporting Information [Line Items]
Revenue									5	5	3
Gas
Segment Reporting Information [Line Items]
Revenue									226	229	209
Other
Segment Reporting Information [Line Items]
Revenue									12	12	11
Operating Segments | IMTT
Segment Reporting Information [Line Items]
Revenue									515	510	549
Operating Segments | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									972	962	847
Operating Segments | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									243	292	278
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										1
Operating Segments | Total service revenue | IMTT
Segment Reporting Information [Line Items]
Revenue									515	510	549
Operating Segments | Total service revenue | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									972	962	847
Operating Segments | Total service revenue | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									0	47	55
Operating Segments | Total service revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Terminal services | IMTT
Segment Reporting Information [Line Items]
Revenue									90	89	85
Operating Segments | Terminal services | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Terminal services | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Terminal services | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Lease | IMTT
Segment Reporting Information [Line Items]
Revenue									419	402	431
Operating Segments | Lease | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Lease | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Lease | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Fuel | IMTT
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Fuel | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									695	704	615
Operating Segments | Fuel | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Fuel | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Hangar | IMTT
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Hangar | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									95	88	78
Operating Segments | Hangar | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Hangar | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Construction | IMTT
Segment Reporting Information [Line Items]
Revenue										0	0
Operating Segments | Construction | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue										0	0
Operating Segments | Construction | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue										43	54
Operating Segments | Construction | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Other | IMTT
Segment Reporting Information [Line Items]
Revenue									6	19	33
Operating Segments | Other | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									182	170	154
Operating Segments | Other | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									0	4	1
Operating Segments | Other | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Total product revenue | IMTT
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Total product revenue | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Total product revenue | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									243	245	223
Operating Segments | Total product revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										1
Operating Segments | Lease | IMTT
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Lease | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Lease | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									5	5	3
Operating Segments | Lease | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Gas | IMTT
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Gas | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Gas | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									226	229	209
Operating Segments | Gas | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										0
Operating Segments | Other | IMTT
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Other | Atlantic Aviation
Segment Reporting Information [Line Items]
Revenue									0	0	0
Operating Segments | Other | MIC Hawaii
Segment Reporting Information [Line Items]
Revenue									12	11	11
Operating Segments | Other | Corporate and Other
Segment Reporting Information [Line Items]
Revenue										1
Segment Reconciling Items
Segment Reporting Information [Line Items]
Revenue									(3)	(4)	(5)
Segment Reconciling Items | Total service revenue
Segment Reporting Information [Line Items]
Revenue									(3)	(4)	(5)
Segment Reconciling Items | Terminal services
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Lease
Segment Reporting Information [Line Items]
Revenue									(3)	(4)	(5)
Segment Reconciling Items | Fuel
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Hangar
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Construction
Segment Reporting Information [Line Items]
Revenue										0	0
Segment Reconciling Items | Other
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Total product revenue
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Lease
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Gas
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment Reconciling Items | Other
Segment Reporting Information [Line Items]
Revenue									$ 0	$ 0	$ 0