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FINANCIAL INSTRUMENTS - Cash and Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Cash and equivalents	$ 5,188	$ 3,314	$ 1,571
Carrying value
Disclosure of detailed information about financial instruments [line items]
Cash deposits	3,713	2,571
Term deposits	1,469	728
Money market investments	6	15
Cash and equivalents		3,314
Carrying value | Cash held in subsidiaries with restrictions
Disclosure of detailed information about financial instruments [line items]
Cash and equivalents	$ 0	$ 0

X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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