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INCOME TAXES - Income Tax Recognized in Profit or Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Current income tax expense $ 106 $ 33 $ 22
Origination and reversal of temporary differences 92 (62) 4
Changes in tax rates or the imposition of new taxes (41) 1 (28)
Previously unrecognized deferred taxes 16 43 (2)
Net income before income tax 747 543 387
Income tax expense calculated at the domestic rates applicable to profits in the country concerned 304 77 74
Change in substantively enacted tax rates (41) 1 (28)
Earnings from investments in associates and joint ventures (12) (34) (16)
Portion of gains subject to different tax rates 2 (54) 2
Taxable income attributable to non-controlling interests (65) (7) (25)
International operations subject to different tax rates (39) (6) (8)
Deferred tax assets not recognized 15 41 4
Permanent differences and other 9 (3) (7)
Total income tax expense (recovery) $ 173 $ 15 $ (4)