INCOME TAXES - Effective Income Tax Rate Applicable to Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. federal statutory income tax	$ 177	$ 123	$ 240
State income taxes, net of federal tax benefit	(3)	(5)	5
REIT income not subject to federal income tax	(99)	(158)	(161)
REIT benefit from change to tax law	0	(13)	0
Foreign taxes	(4)	4	2
Provision for unrecognized tax benefits	0	(7)	(4)
Repatriation of Canadian earnings	24	0	0
Other, net	(6)	(2)	(11)
Total income tax provision (benefit)	$ 89	$ (58)	$ 71
Effective income tax rate	17.60%	(16.40%)	10.30%