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Pensions and Post-Employment Benefits - Schedule Actuarial Results Related to Pension and Other Post Retirement Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Recorded in operating costs and expenses      
Service cost $ 12 $ 12 $ 13
Past service cost (1) 1 9
Settlements and curtailments (1) (3)  
Total defined benefit expense 10 10 22
Recorded in other financial expenses      
Net interest cost 33 39 40
Recorded in other comprehensive income      
Actuarial (gains) losses for the period 199 210 (176)
Total (loss) / gain recognized during the period 242 259 (114)
Pension defined benefit plans [member]      
Recorded in operating costs and expenses      
Service cost 10 10 10
Past service cost (2) 1 9
Settlements and curtailments (1) (3)  
Total defined benefit expense 8 8 19
Recorded in other financial expenses      
Net interest cost 28 34 35
Recorded in other comprehensive income      
Actuarial (gains) losses for the period 181 203 (176)
Total (loss) / gain recognized during the period 217 245 (122)
Other Benefits Plans [Member]      
Recorded in operating costs and expenses      
Service cost 2 2 3
Past service cost 1    
Settlements and curtailments (1)    
Total defined benefit expense 2 2 3
Recorded in other financial expenses      
Net interest cost 5 5 5
Recorded in other comprehensive income      
Actuarial (gains) losses for the period 18 7 (176)
Total (loss) / gain recognized during the period $ 25 $ 14 $ 8