SHAREHOLDERS' INTEREST - Reconciliation of Our Common Share Activity (Details) - shares		12 Months Ended
	Jul. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Outstanding at beginning of year		510,483,000	524,474,000	583,548,000
New issuance		0	0	0
Shares tendered (Note 3)		0	0	(58,813,000)
Preference shares converted to common shares	23,200,000	23,345,000	0	0
Repurchased		(67,817,000)	(16,190,000)	(6,063,000)
Outstanding at end of year		748,528,000	510,483,000	524,474,000
Stock options
Class of Stock [Line Items]
Shares issued for share-based compensation		2,571,000	1,592,000	5,134,000
Restricted stock units
Class of Stock [Line Items]
Shares issued for share-based compensation		840,000	365,000	451,000
Performance share units
Class of Stock [Line Items]
Shares issued for share-based compensation		219,000	242,000	217,000
Plum Creek
Class of Stock [Line Items]
Issuance from merger with Plum Creek (Note 4)		278,886,704	0	0