Reportable Segments (Schedule of EBITDA for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net income from continuing operations	$ 11	$ 64
Interest expense, net	42	39
Provision (benefit) for income taxes	9	24
Depreciation	51	48
Amortization of intangibles	14	15
Fees to Manager-related party	7	8
Other non-cash expense	7	4
EBITDA excluding non-cash items	141	202
IMTT
Segment Reporting Information [Line Items]
Net income from continuing operations	18	41
Interest expense, net	15	13
Provision (benefit) for income taxes	7	16
Depreciation	31	29
Amortization of intangibles	3	4
Fees to Manager-related party	0	0
Other non-cash expense	3	1
EBITDA excluding non-cash items	77	104
Atlantic Aviation
Segment Reporting Information [Line Items]
Net income from continuing operations	14	25
Interest expense, net	19	19
Provision (benefit) for income taxes	5	9
Depreciation	16	15
Amortization of intangibles	11	11
Fees to Manager-related party	0	0
Other non-cash expense	1	0
EBITDA excluding non-cash items	66	79
MIC Hawaii
Segment Reporting Information [Line Items]
Net income from continuing operations	3	8
Interest expense, net	3	3
Provision (benefit) for income taxes	2	3
Depreciation	4	4
Amortization of intangibles	0	0
Fees to Manager-related party	0	0
Other non-cash expense	3	2
EBITDA excluding non-cash items	15	20
Corporate and Other
Segment Reporting Information [Line Items]
Net income from continuing operations	(24)	(10)
Interest expense, net	5	4
Provision (benefit) for income taxes	(5)	(4)
Depreciation	0	0
Amortization of intangibles	0	0
Fees to Manager-related party	7	8
Other non-cash expense	0	1
EBITDA excluding non-cash items	$ (17)	$ (1)