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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)