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Employee Benefits - Costs by Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 53 $ 66
Amortization of prior service cost (credit) 28 15
Expected return on plan assets (253) (297)
Interest cost 188 110
Other components (37) (172)
Total 16 (106)
Pension | Cost of services    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 46 58
Pension | Selling, general and administrative expense    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 7 8
Health Care and Life    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 13 23
Amortization of prior service cost (credit) (105) (203)
Expected return on plan assets (7) (7)
Interest cost 136 83
Other components 24 (127)
Total 37 (104)
Health Care and Life | Cost of services    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 11 19
Health Care and Life | Selling, general and administrative expense    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2 $ 4