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Employee Benefits - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 06, 2024
retiree
Feb. 29, 2024
USD ($)
agreement
Dec. 31, 2023
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]                
Number of pension authorization commitment agreements | agreement   2            
Liability, defined benefit plan   $ 5,900            
Amount paid in severance benefits over the period       $ 60     $ 178  
Post employment benefits liability       402     $ 402  
Pension                
Defined Benefit Plan Disclosure [Line Items]                
Expected return on plan assets     7.50%       8.00%  
Number of retirees receiving benefit payments from pension plan | retiree 56,000              
Defined benefit plan, plan assets, increase (decrease) for assets transferred to (from) plan             $ 5,700  
Employer discretionary contribution amount             365 $ 200
Remeasurement gain (loss), net       (136) $ 73 $ 0 $ (63) $ 0
Defined benefit plan, benefit obligation, actuarial gain (loss) from pension annuitization         200      
Defined benefit plan, benefit obligation, actuarial gain (loss) from settlements         (127)      
Charge due to difference between estimated and actual return on assets       245 613      
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate       $ 109 $ 486