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INCOME TAXES - Income tax expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income taxes      
Current year $ 397 $ 615 $ 712
Adjustments in respect of previous years (28) (3) 38
Total current income taxes 369 612 750
Deferred income taxes      
Origination / reversal of temporary differences (166) (217) (782)
Changes in tax rates 10 (7) 24
Current year tax losses unrecognized 153 172 207
Recognition / utilization of previously unrecognized tax losses or tax credits   (15) (23)
Derecognition of previously recognized tax losses   95 32
Expiration of tax losses   2  
Write off deferred tax assets 20   7
Adjustments in respect of previous years 86   6
Other   (7) (1)
Total deferred tax expense 103 23 (530)
Income tax expense $ 472 $ 635 $ 220