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Employee Benefits - Costs by Plans (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
Pension          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 52 $ 59   $ 157 $ 191
Amortization of prior service cost (credit) 28 24   84 54
Expected return on plan assets (254) (274)   (760) (865)
Interest cost 188 151   564 375
Remeasurement loss, net 0 645 $ 198 0 843
Other components (38) 546   (112) 407
Total 14 605   45 598
Pension | Cost of services          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 46 52   137 168
Pension | Selling, general and administrative expense          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 6 7   20 23
Health Care and Life          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 13 24   40 71
Amortization of prior service cost (credit) (105) (106)   (314) (419)
Expected return on plan assets (9) (6)   (24) (20)
Interest cost 137 83   409 249
Remeasurement loss, net 0 0   0 0
Other components 23 (29)   71 (190)
Total 36 (5)   111 (119)
Health Care and Life | Cost of services          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 11 20   34 60
Health Care and Life | Selling, general and administrative expense          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 2 $ 4   $ 6 $ 11