Retirement Benefits (Reconciliation of Net Actuarial Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension  Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	$ (209)	$ (240)	$ (222)
Post-retirement Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	2	2	1
Net actuarial losses
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	150	208	161
U.S. | Net actuarial losses | Pension  Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(1,777)	(2,446)
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	74	90
Liability experience	1,625	227
Asset experience	(1,341)	353
Other	0	(1)
Total amount recognized as change in plan assets and benefit obligations	284	579
Ending balance	(1,419)	(1,777)	(2,446)
U.S. | Net actuarial losses | Post-retirement Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	3	3
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	0	(1)
Liability experience	3	1
Asset experience	0	0
Other	2	0
Total amount recognized as change in plan assets and benefit obligations	5	1
Ending balance	8	3	3
Non-U.S. | Pension  Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	(140)	(187)	(162)
Non-U.S. | Post-retirement Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	1	2	0
Non-U.S. | Net actuarial losses | Pension  Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(2,904)	(3,467)
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	75	116
Effect of settlement	2	5
Total recognized as component of net periodic benefit cost (credit)	77	121
Liability experience	3,953	617
Asset experience	(4,051)	(199)
Effect of curtailment	0	2
Total amount recognized as change in plan assets and benefit obligations	(98)	420
Exchange rate adjustments	315	22
Ending balance	(2,610)	(2,904)	(3,467)
Non-U.S. | Net actuarial losses | Post-retirement Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(10)	(16)
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	1	2
Effect of settlement	0	0
Total recognized as component of net periodic benefit cost (credit)	1	2
Liability experience	14	4
Asset experience	0	0
Effect of curtailment	0	0
Total amount recognized as change in plan assets and benefit obligations	14	4
Exchange rate adjustments	1	0
Ending balance	$ 6	$ (10)	$ (16)