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Details of Cash From Operating Activities - Components of Cash, Cash Equivalents and Restricted Cash Equivalents (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Bank term deposits and bankers' acceptances	$ 1,987	$ 724
Cash	1,281	552
Cash and cash equivalents	3,268	1,276
Restricted cash equivalents included in prepaid expenses [note 15]	106	116
Cash, cash equivalents and restricted cash equivalents	$ 3,374	$ 1,392	$ 802

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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