CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 153	$ 95	$ 456
Other comprehensive (loss) income, net of taxes:
Change in post-retirement benefit plans	[1]	(9)	9	(4)
Translation adjustment	[2]	2	(5)	3
Other comprehensive (loss) income		(7)	4	(1)
Comprehensive income		146	99	455
Less: comprehensive (loss) income attributable to noncontrolling interests		(3)	(42)	5
Comprehensive income attributable to MIC		$ 149	$ 141	$ 450

[1] Change in post-retirement benefit plans is presented net of tax benefit of $3 million in both 2019 and 2017 and net of tax expense of $3 million in 2018. See Note 11, “Stockholders’ Equity”, for further discussions.

[2] Translation adjustment is presented net of tax expense of $1 million and $2 million in 2019 and 2017, respectively, and net of tax benefit of $2 million in 2018. See Note 11, “Stockholders’ Equity”, for further discussions.