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Financial Instruments - Schedule of Company's Financial Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 3,268 | $ 1,276
Restricted cash equivalents | 106 | 116
Accounts receivable | 6,394 | 5,927
Private equity investments | 267 | 95
Severance investments | 1 | 1
Long-term receivables included in other assets [note 12] | 209 | 217
Total | 10,245 | 7,632
Financial liabilities |  |
Long-term debt (including portion due within one year) | 4,102 | 3,168
Accounts payable | 6,266 | 5,628
Other Liabilities, Total | 10,368 | 8,796
Foreign currency contracts designated as effective hedges, measured at fair value |  |
Derivative assets designated as effective hedges, measured at fair value | 68 | 70
Derivative liabilities designated as effective hedges, measured at fair value | (16) | (18)
Foreign Exchange Contract [Member] |  |
Foreign currency contracts designated as effective hedges, measured at fair value |  |
Assets, Net amounts | 52 | 52
Prepaid Expenses and Other [Member] | Foreign Exchange Contract [Member] |  |
Foreign currency contracts designated as effective hedges, measured at fair value |  |
Derivative assets designated as effective hedges, measured at fair value | 52 | 46
Other Assets [Member] | Foreign Exchange Contract [Member] |  |
Foreign currency contracts designated as effective hedges, measured at fair value |  |
Derivative assets designated as effective hedges, measured at fair value | 16 | 24
Other Accrued Liabilities [Member] | Foreign Exchange Contract [Member] |  |
Foreign currency contracts designated as effective hedges, measured at fair value |  |
Derivative liabilities designated as effective hedges, measured at fair value | (11) | (10)
Other Long-term Liabilities [Member] | Foreign Exchange Contract [Member] |  |
Foreign currency contracts designated as effective hedges, measured at fair value |  |
Derivative liabilities designated as effective hedges, measured at fair value | $ (5) | $ (8)

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