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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flow Statement [Abstract]
Interest paid	$ 222	$ 161	$ 136
Income taxes paid	135	96	107
Changes In Non-cash Working Capital [Abstract]
Accounts receivable	(71)	(58)	(21)
Accounts payable and other	27	131	36
Changes in non-cash working capital, net	$ (44)	$ 73	$ 15

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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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The increase (decrease) in working capital.

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The cash outflow for interest paid, classified as operating activities.

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