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Employee Benefit Plans - Defined Contribution Plans And Defined Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2020
Jan. 01, 2019
Defined Benefit Plan Disclosure [Line Items]            
Company's assumed health care cost trend rate for the next seven years   6.00%        
Company's assumed ultimate health care cost trend rate   4.50%        
Year in which ultimate cost trend rate is assumed to reach   2023        
Expenses related to matching contributions   $ 56 $ 49 $ 47    
Scenario Forecast [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Pension and postretirement benefit contributions $ 29          
U.S. Government Treasury Bonds [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Cash balance crediting rate as a portion of yield   0.0833%        
Investment credit term   30 years        
Cash balance credit rate percentage   0.25%        
Pension Benefits [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, expected rate of return on plan assets   $ 41 42      
Actual return on plan assets   $ 108 $ (26)      
Pension Benefits [Member] | United States [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   4.42% 3.69% 4.17%    
Defined benefit plan, expected rate of return on plan assets   $ 25 $ 27 $ 24    
Actual return on plan assets   $ 77 $ (24)      
Pension Benefits [Member] | United States [Member] | Subsequent Event [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, percentage of expected rate of return on plan assets         7.75%  
Pension Benefits [Member] | United States and United Kingdom pension plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Percentage of consolidated benefit obligation   75.00%        
Pension Benefits [Member] | Non-United States Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   1.99% 1.91% 1.89%    
Defined benefit plan, expected rate of return on plan assets   $ 16 $ 15 $ 14    
Actual return on plan assets   $ 34 $ (2)      
Minimum [Member] | Pension Benefits [Member] | United States [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   2.70%        
Minimum [Member] | Pension Benefits [Member] | United Kingdom Pension Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   1.68%        
Minimum [Member] | Pension Benefits [Member] | Non-United States Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   0.17%        
Defined benefit plan, percentage of expected rate of return on plan assets           1.00%
Minimum [Member] | Pension Benefits [Member] | Non-United States Plans [Member] | Subsequent Event [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, percentage of expected rate of return on plan assets         1.00%  
Maximum [Member] | Pension Benefits [Member] | United States [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   3.58%        
Maximum [Member] | Pension Benefits [Member] | United Kingdom Pension Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   2.10%        
Maximum [Member] | Pension Benefits [Member] | Non-United States Plans [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Discount rate   8.37%        
Defined benefit plan, percentage of expected rate of return on plan assets           7.22%
Maximum [Member] | Pension Benefits [Member] | Non-United States Plans [Member] | Subsequent Event [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined benefit plan, percentage of expected rate of return on plan assets         5.00%