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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Recorded in operating costs and expenses      
Service cost $ 12 $ 12 $ 12
Past service cost   (1) 1
Settlements and curtailments (2) (1) (3)
Total defined benefit expense 10 10 10
Recorded in other financial expenses      
Net interest cost 31 33 39
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (263) 199 210
Total (loss) / gain recognized during the period (222) 242 259
Pension defined benefit plans [member]      
Recorded in operating costs and expenses      
Service cost 9 10 10
Past service cost   (2) 1
Settlements and curtailments (1) 0 (3)
Total defined benefit expense 8 8 8
Recorded in other financial expenses      
Net interest cost 26 28 34
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (257) 181 203
Total (loss) / gain recognized during the period (223) 217 245
Other Benefits Plans [Member]      
Recorded in operating costs and expenses      
Service cost 3 2 2
Past service cost   1  
Settlements and curtailments (1) (1)  
Total defined benefit expense 2 2 2
Recorded in other financial expenses      
Net interest cost 5 5 5
Recorded in other comprehensive income      
Actuarial (gains) losses for the period (6) 18 7
Total (loss) / gain recognized during the period $ 1 $ 25 $ 14