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Employee Benefits - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]          
Amount paid in severance benefits over the period $ 224     $ 450  
Pre-tax severance changes 35     284  
Post employment benefits liability 434     434  
Pension          
Defined Benefit Plan Disclosure [Line Items]          
Employer discretionary contribution amount       200  
Remeasurement gain (loss), net $ 0 $ (645) $ (198) $ 0 $ (843)
Charge due to difference between estimated and actual return on assets   3,500 654    
Credit due to change in discount rate assumption   $ 2,900 $ 456