v3.26.1
Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Other Postretirement Benefits    
Service cost $ 21 $ 23
Interest cost 65 65
Expected return on plan assets (4) (4)
Amortization of actuarial loss/(gain) (22) (24)
Amortization of prior service cost (15) (15)
Net benefit cost 45 45
Pension Benefits - U.S. | Pension Plan    
Service cost 127 136
Interest cost 165 170
Expected return on plan assets (164) (149)
Amortization of actuarial loss/(gain) 5 18
Amortization of prior service cost (8) (7)
Net pension enhancement and curtailment/settlement cost (1) 36
Net benefit cost 124 204
Pension Benefits - Non-U.S. | Pension Plan    
Service cost 72 78
Interest cost 239 222
Expected return on plan assets (231) (221)
Amortization of actuarial loss/(gain) (10) 9
Amortization of prior service cost 15 13
Net pension enhancement and curtailment/settlement cost 28 0
Net benefit cost $ 113 $ 101