CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Millions		Total	Class A Common Stock Class A Common Stock		Additional Paid-in- Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2014		$ (2,200)	$ 5		$ 2,802	$ 4,286	$ (9,223)	$ (70)
Beginning balance (in shares) at Dec. 31, 2014			279,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		859				859
Other comprehensive loss		(126)						(126)
Dividends		(253)				(253)
Share-based compensation plans (in shares)			2,100,000
Share-based compensation plans		70			19	(14)	65
Purchase of treasury stock		(1,940)					(1,940)
Purchase of treasury stock (in shares)			(25,700,000)
Ending balance at Dec. 31, 2015		(3,590)	$ 5		2,821	4,878	(11,098)	(196)
Ending balance (in shares) at Dec. 31, 2015			256,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		780				780
Other comprehensive loss		(301)						(301)
Dividends		(374)				(374)
Share-based compensation plans (in shares)			1,800,000
Share-based compensation plans		146			110	(21)	57
Purchase of treasury stock		(573)					(573)
Purchase of treasury stock (in shares)			(8,000,000)
Starwood Combination	[1]	9,269			2,877	1,238	5,154
Starwood Combination (in shares)	[1]		136,000,000
Ending balance at Dec. 31, 2016		5,357	$ 5		5,808	6,501	(6,460)	(497)
Ending balance (in shares) at Dec. 31, 2016			386,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,372				1,372
Other comprehensive loss		480						480
Dividends		(482)				(482)
Share-based compensation plans (in shares)			2,200,000
Share-based compensation plans		29			(38)	0	67
Purchase of treasury stock		(3,025)					(3,025)
Purchase of treasury stock (in shares)			(29,200,000)
Ending balance at Dec. 31, 2017		$ 3,731	$ 5		$ 5,770	$ 7,391	$ (9,418)	$ (17)
Ending balance (in shares) at Dec. 31, 2017		359,100,000	359,100,000	[2]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, authorized (in shares)		800,000,000
Common stock, par value (in USD per share)		$ 0.01
Preferred stock, authorized (in shares)		10,000,000
Preferred stock, outstanding (in shares)		0

[1] Represents Marriott common stock and equity-based awards issued in the Starwood Combination, which also resulted in the depletion of our accumulated historical losses on reissuances of treasury stock in Retained Earnings.

[2] Our restated certificate of incorporation authorizes 800 million shares of our common stock, with a par value of $.01 per share and 10 million shares of preferred stock, without par value. At year-end 2017, we had 359.1 million of these authorized shares of our common stock and no preferred stock outstanding.