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Employee Benefits - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 06, 2024
retiree
Feb. 29, 2024
USD ($)
agreement
Dec. 31, 2023
Mar. 31, 2024
USD ($)
Mar. 31, 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       $ 118  
Post employment benefits liability       $ 456  
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 $ 0
Remeasurement gain (loss), net       73 $ 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       613  
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate       $ 486