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Employee Benefits - Costs by Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 48 $ 53
Amortization of prior service cost (credit) 28 28
Expected return on plan assets (208) (253)
Interest cost 157 188
Remeasurement gain, net (73) 0
Other components (96) (37)
Total (48) 16
Pension | Cost of services    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 41 46
Pension | Selling, general and administrative expense    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 7 7
Health Care and Life    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 13 13
Amortization of prior service cost (credit) (32) (105)
Expected return on plan assets (7) (7)
Interest cost 135 136
Remeasurement gain, net 0 0
Other components 96 24
Total 109 37
Health Care and Life | Cost of services    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 11 11
Health Care and Life | Selling, general and administrative expense    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2 $ 2