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Employee Benefits - Costs by Plans (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension            
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 40 $ 45     $ 120 $ 138
Amortization of prior service cost (credit) 28 28     84 84
Expected return on plan assets (133) (134)     (401) (482)
Interest cost 102 111     306 380
Remeasurement gain, net (31) (46) $ 136 $ (73) 14 17
Other components (34) (41)     3 (1)
Total 6 4     123 137
Pension | Cost of services            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 34 39     103 119
Pension | Selling, general and administrative expense            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 6 6     17 19
Health Care and Life            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 8 13     25 39
Amortization of prior service cost (credit) (33) (32)     (97) (96)
Expected return on plan assets (7) (7)     (21) (21)
Interest cost 137 136     410 407
Remeasurement gain, net 0 0     0 0
Other components 97 97     292 290
Total 105 110     317 329
Health Care and Life | Cost of services            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 7 11     21 33
Health Care and Life | Selling, general and administrative expense            
Defined Benefit Plan Disclosure [Line Items]            
Service cost $ 1 $ 2     $ 4 $ 6