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FINANCIAL INSTRUMENTS - Cash and Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Cash and equivalents	$ 1,571	$ 2,234	$ 2,389
Carrying value
Disclosure of detailed information about financial instruments [line items]
Cash deposits	842	662
Term deposits	477	427
Money market investments	252	1,145
Cash and equivalents	1,571	2,234
Carrying value | Cash held in subsidiaries with restrictions
Disclosure of detailed information about financial instruments [line items]
Cash and equivalents	$ 383	$ 305

X

- Definition

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

+ References

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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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