Retirement Benefits (Components of the Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension  Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 28	$ 38	$ 36
Interest cost	389	341	421
Expected return on plan assets	(778)	(832)	(844)
Amortization of prior service	1
Recognized actuarial loss (gain)	149	206	161
Net periodic benefit (credit) cost	(211)	(247)	(226)
Curtailment loss	0	2	0
Plan termination	0	0	1
Settlement loss	2	5	3
Net benefit (credit) cost	(209)	(240)	(222)
Pension  Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	193	184	213
Expected return on plan assets	(336)	(327)	(345)
Recognized actuarial loss (gain)	74	90	72
Net periodic benefit (credit) cost	(69)	(53)	(60)
Pension  Benefits | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	28	38	36
Interest cost	196	157	208
Expected return on plan assets	(442)	(505)	(499)
Amortization of prior service	1	0	0
Recognized actuarial loss (gain)	75	116	89
Net periodic benefit (credit) cost	(142)	(194)	(166)
Curtailment loss	0	2	0
Plan termination	0	0	1
Settlement loss	2	5	3
Net benefit (credit) cost	(140)	(187)	(162)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	3	2	3
Expected return on plan assets	0	0	0
Amortization of prior service	(2)	(2)	(2)
Recognized actuarial loss (gain)	1	1	0
Net periodic benefit (credit) cost	2	2	1
Curtailment loss	0	0	0
Plan termination	0	0	0
Settlement loss	0	0	0
Net benefit (credit) cost	2	2	1
Post-retirement Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1	1
Expected return on plan assets	0	0	0
Recognized actuarial loss (gain)	0	(1)
Net periodic benefit (credit) cost	1	0	1
Post-retirement Benefits | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	2	1	2
Expected return on plan assets	0	0	0
Amortization of prior service	(2)	(2)	(2)
Recognized actuarial loss (gain)	1	2	0
Net periodic benefit (credit) cost	1	2	0
Curtailment loss	0	0	0
Plan termination	0	0	0
Settlement loss	0	0	0
Net benefit (credit) cost	$ 1	$ 2	$ 0