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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 5	$ 21	$ 17
Interest cost	151	146	445	434
Expected return on plan assets	(215)	(222)	(631)	(657)
Amortization of prior service (credit) cost	1	0	1	1
Recognized actuarial loss	11	8	32	23
Net periodic benefit credit	(44)	(63)	(132)	(182)
Settlement loss	0	1	10	1
Net benefit credit	(44)	(62)	(122)	(181)
United States
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	1	0
Interest cost	64	62	191	187
Expected return on plan assets	(74)	(76)	(220)	(227)
Recognized actuarial loss	6	5	18	15
Net periodic benefit credit			(10)	(25)
Settlement loss			1	0
Net benefit credit	(3)	(9)	(9)	(25)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	5	20	17
Interest cost	87	84	254	247
Expected return on plan assets	(141)	(146)	(411)	(430)
Amortization of prior service (credit) cost	1	0	1	1
Recognized actuarial loss	5	3	14	8
Net periodic benefit credit	(41)	(54)	(122)	(157)
Settlement loss	0	1	9	1
Net benefit credit	$ (41)	$ (53)	$ (113)	$ (156)