v3.26.1
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
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 6 $ 6
Interest cost 144 145
Expected return on plan assets (220) (204)
Recognized actuarial loss 23 10
Net periodic benefit credit (47) (43)
Settlement loss 2 5
Net benefit cost (credit) (45) (38)
United States    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 62 64
Expected return on plan assets (70) (73)
Recognized actuarial loss 9 6
Net benefit cost (credit) 1 (3)
Foreign Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 6 6
Interest cost 82 81
Expected return on plan assets (150) (131)
Recognized actuarial loss 14 4
Net periodic benefit credit (48) (40)
Settlement loss 2 5
Net benefit cost (credit) $ (46) $ (35)