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Pensions and Post-Employment Benefits - Schedule of Reconciliations of the Actuarial Benefits Obligations, Pension Plan Assets, And Liabilities Recognized in the Balance Sheet (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period $ 2,738 $ 2,454  
Service cost 12 12 $ 13
Interest cost 75 83  
Actuarial (gains) losses 276 275  
Additions through business combinations 1    
Settlements and curtailments (1) (3)  
Reduction from disposal of assets   (2)  
Plan amendments (1) 1  
Benefits paid (146) (148)  
Foreign currency translation 79 66  
Projected benefit obligation at end of the period 3,033 2,738 2,454
Fair value of plan assets at beginning of the period 1,600 1,487  
Return on plan assets 42 44  
Actuarial gains (losses) 77 65  
Employer contributions 81 110  
Reduction for disposal of assets   (1)  
Benefits paid (146) (148)  
Foreign currency translation 40 43  
Fair value of plan assets at end of the period 1,694 1,600 1,487
Net projected liability in the statement of financial position 1,339 1,138  
Pension defined benefit plans [member]      
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period 2,651 2,375  
Service cost 10 10 10
Interest cost 70 78  
Actuarial (gains) losses 258 268  
Additions through business combinations 1    
Settlements and curtailments (1) (3)  
Reduction from disposal of assets   (2)  
Plan amendments (2) 1  
Benefits paid (140) (141)  
Foreign currency translation 80 65  
Projected benefit obligation at end of the period 2,928 2,651 2,375
Fair value of plan assets at beginning of the period 1,599 1,486  
Return on plan assets 42 44  
Actuarial gains (losses) 77 65  
Employer contributions 75 103  
Reduction for disposal of assets   (1)  
Benefits paid (140) (141)  
Foreign currency translation 40 43  
Fair value of plan assets at end of the period 1,693 1,599 1,486
Net projected liability in the statement of financial position 1,235 1,052  
Other Benefits Plans [Member]      
Disclosure of defined benefit plans [line items]      
Projected benefit obligation at beginning of the period 87 79  
Service cost 2 2 3
Interest cost 5 5  
Actuarial (gains) losses 18 7  
Settlements and curtailments (1)    
Plan amendments 1    
Benefits paid (6) (7)  
Foreign currency translation (1) 1  
Projected benefit obligation at end of the period 105 87 79
Fair value of plan assets at beginning of the period 1 1  
Employer contributions 6 7  
Benefits paid (6) (7)  
Fair value of plan assets at end of the period 1 1 $ 1
Net projected liability in the statement of financial position $ 104 $ 86