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Employee Benefits - Costs by Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension            
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 45     $ 52 $ 138 $ 157
Amortization of prior service cost (credit) 28     28 84 84
Expected return on plan assets (134)     (254) (482) (760)
Interest cost 111     188 380 564
Remeasurement gain, net (46) $ 136 $ (73) 0 17 0
Other components (41)     (38) (1) (112)
Total 4     14 137 45
Pension | Cost of services            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 39     46 119 137
Pension | Selling, general and administrative expense            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 6     6 19 20
Health Care and Life            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 13     13 39 40
Amortization of prior service cost (credit) (32)     (105) (96) (314)
Expected return on plan assets (7)     (9) (21) (24)
Interest cost 136     137 407 409
Remeasurement gain, net 0     0 0 0
Other components 97     23 290 71
Total 110     36 329 111
Health Care and Life | Cost of services            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 11     11 33 34
Health Care and Life | Selling, general and administrative expense            
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 2     $ 2 $ 6 $ 6