Retirement Benefits (Schedule of 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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6	$ 5	$ 12	$ 11
Interest cost	144	150	288	298
Expected return on plan assets	(216)	(215)	(435)	(427)
Amortization of prior service (credit) cost	1	0	1	0
Recognized actuarial loss	7	5	15	11
Net benefit credit	(58)	(55)	(119)	(107)
United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	63	65	125	130
Expected return on plan assets	(75)	(77)	(151)	(155)
Recognized actuarial loss	5	4	10	9
Net benefit credit	(7)	(8)	(16)	(16)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	12	11
Interest cost	81	85	163	168
Expected return on plan assets	(141)	(138)	(284)	(272)
Amortization of prior service (credit) cost	1	0	1	0
Recognized actuarial loss	2	1	5	2
Net benefit credit	$ (51)	$ (47)	$ (103)	$ (91)