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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flow Statement [Abstract]
Interest paid	$ 829	$ 507	$ 451
Income taxes paid	179	427	132
Changes in non-cash working capital
Accounts receivable	42	176	(31)
Prepayments	(120)	5	4
Accounts payable and other	146	(305)	158
Changes in non-cash working capital, net	$ 68	$ (124)	$ 131

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Adjustments for Decrease (Increase), Prepayments

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Cash Flow Statement [Abstract]

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Changes In Non-cash Working Capital [Abstract]

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- Definition

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 cash outflow for interest paid, classified as operating activities.

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