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BASIS OF PRESENTATION - Minority interest activity (Details) CAD / shares in Units, CAD in Millions, $ in Millions		3 Months Ended	9 Months Ended
	Jul. 07, 2015 CAD CAD / shares shares	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jul. 07, 2015 USD ($)
Deconsolidation disclosures
Gain from derecognization of assets, liabilities, and non-controlling interest		$ 76	$ 76
TMAC
Sale of stock by subsidiary
Ownership/Economic interest in subsidiaries		29.38%	29.38%
Deconsolidation disclosures
Investment in affilates		$ 104	$ 104
TMAC \| Other income, net'
Deconsolidation disclosures
Gain from derecognization of assets, liabilities, and non-controlling interest		$ 76
TMAC \| Term Loan Facility
Sale of stock by subsidiary
Line of credit facility maximum borrowing capacity				$ 120
TMAC \| IPO
Sale of stock by subsidiary
Shares issued in subsidiary IPO \| shares	22,500,000
IPO share price (in Nicaraguan Cordobas per share) \| CAD / shares	CAD 6.00
Proceeds from initial public offering \| CAD	CAD 135