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Impairment, Restructuring Charges and Other Related Closure Costs - Changes to Restructuring Provisions Recorded on Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]    
Provision, beginning balance $ 11 $ 35
Charges incurred 8  
Adjustment for unused provisions (1) (2)
Amounts paid (14) (21)
Currency translation effect   (1)
Provision, ending balance 4 11
Set-top Box Restructuring Plan [Member]    
Restructuring Cost And Reserve [Line Items]    
Provision, beginning balance 11 34
Adjustment for unused provisions (1) (2)
Amounts paid (6) (20)
Currency translation effect   (1)
Provision, ending balance 4 11
Bouskoura Restructuring Plan [Member]    
Restructuring Cost And Reserve [Line Items]    
Charges incurred 8  
Amounts paid $ (8)  
Other Restructuring Initiatives    
Restructuring Cost And Reserve [Line Items]    
Provision, beginning balance   1
Amounts paid   $ (1)