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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, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Provision, beginning balance $ 52 $ 54
Charges incurred 19 52
Adjustment for unused provisions   (7)
Amounts paid (33) (51)
Currency translation effect (3) 4
Provision, ending balance 35 52
Set-top Box Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Provision, beginning balance 39 37
Charges incurred 19 36
Adjustment for unused provisions   (2)
Amounts paid (22) (36)
Currency translation effect (2) 4
Provision, ending balance 34 39
$600-650 Million Net Opex Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Provision, beginning balance 7 5
Charges incurred   3
Amounts paid (7) (1)
Provision, ending balance   7
Other Restructuring Initiatives [Member]    
Restructuring Cost and Reserve [Line Items]    
Provision, beginning balance 6 12
Charges incurred   13
Adjustment for unused provisions   (5)
Amounts paid (4) (14)
Currency translation effect (1)  
Provision, ending balance $ 1 $ 6