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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flow Statement [Abstract]
Interest paid	$ 451	$ 366	$ 332
Income taxes paid	132	33	22
Changes in non-cash working capital
Accounts receivable	(31)	31	27
Prepayments and other	4	3	1
Accounts payable and other	158	11	(110)
Changes in non-cash working capital, net	$ 131	$ 45	$ (82)

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Adjustments for Decrease (Increase), Prepayments And Other

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Cash Flow Statement [Abstract]

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Changes In Non-cash Working Capital [Abstract]

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Adjustments for decrease (increase) in trade accounts receivable to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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Adjustments for increase (decrease) in trade and other payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other payables; Profit (loss)]

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The cash flows from income taxes paid or refunded.

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