v3.26.3
Retirement Benefits (Defined Benefit Plan Net Periodic Benefit Cost Combined U.S. and Significant Non-U.S. Plans) (Details) - Pension Benefits - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6 $ 8 $ 19 $ 21
Interest cost 144 151 432 445
Expected return on plan assets (219) (215) (659) (631)
Amortization of prior service (credit) cost 1 1 1 1
Recognized actuarial loss 23 11 70 32
Net periodic benefit cost (credit) (45) (44) (137) (132)
Settlement loss 3 0 5 10
Net benefit cost (credit) (42) (44) (132) (122)
United States        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 0 1
Interest cost 62 64 186 191
Expected return on plan assets (70) (74) (210) (220)
Recognized actuarial loss 9 6 27 18
Net periodic benefit cost (credit)     3 (10)
Settlement loss     0 1
Net benefit cost (credit) 1 (3) 3 (9)
Foreign Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 7 19 20
Interest cost 82 87 246 254
Expected return on plan assets (149) (141) (449) (411)
Amortization of prior service (credit) cost 1 1 1 1
Recognized actuarial loss 14 5 43 14
Net periodic benefit cost (credit) (46) (41) (140) (122)
Settlement loss 3 0 5 9
Net benefit cost (credit) $ (43) $ (41) $ (135) $ (113)