Reportable Segments (Schedule of EBITDA for Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net income from continuing operations	$ 101	$ 65	$ 434
Interest expense, net	147	112	87
Provision (benefit) for income taxes	39	50	(230)
Goodwill impairment	0	3	0
Depreciation	195	193	178
Amortization of intangible assets	59	68	64
Fees to Manager-related party	32	45	71
Other non-cash expense, net	26	33	14
EBITDA excluding non-cash items	599	569	618
IMTT
Segment Reporting Information [Line Items]
Net income from continuing operations	71	63	363
Interest expense, net	47	46	38
Provision (benefit) for income taxes	29	36	(209)
Goodwill impairment		0
Depreciation	117	117	113
Amortization of intangible assets	15	15	13
Fees to Manager-related party	0	0	0
Other non-cash expense, net	9	9	8
EBITDA excluding non-cash items	288	286	326
Atlantic Aviation
Segment Reporting Information [Line Items]
Net income from continuing operations	69	96	124
Interest expense, net	74	25	15
Provision (benefit) for income taxes	24	35	6
Goodwill impairment		0
Depreciation	62	60	51
Amortization of intangible assets	44	46	49
Fees to Manager-related party	0	0	0
Other non-cash expense, net	3	1	2
EBITDA excluding non-cash items	276	263	247
MIC Hawaii
Segment Reporting Information [Line Items]
Net income from continuing operations	13	(12)	26
Interest expense, net	10	8	7
Provision (benefit) for income taxes	9	(6)	9
Goodwill impairment		3
Depreciation	16	16	14
Amortization of intangible assets	0	7	2
Fees to Manager-related party	0	0	0
Other non-cash expense, net	12	22	3
EBITDA excluding non-cash items	60	38	61
Corporate and Other
Segment Reporting Information [Line Items]
Net income from continuing operations	(52)	(82)	(79)
Interest expense, net	16	33	27
Provision (benefit) for income taxes	(23)	(15)	(36)
Goodwill impairment		0
Depreciation	0	0	0
Amortization of intangible assets	0	0	0
Fees to Manager-related party	32	45	71
Other non-cash expense, net	2	1	1
EBITDA excluding non-cash items	$ (25)	$ (18)	$ (16)