Retirement Benefits (Reconciliation of Net Actuarial Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension  Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	$ (240)	$ (222)	$ (234)
Post-retirement Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	2	1	0
Net Actuarial (Loss) Gain
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	208	161	102
U.S. | Pension  Benefits
Recognized as component of net periodic benefit cost (credit):
Other	0	0
U.S. | Post-retirement Benefits
Recognized as component of net periodic benefit cost (credit):
Other	0	1
U.S. | Net Actuarial (Loss) Gain | Pension  Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(2,446)	(2,114)
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	90	72
Liability experience	227	(650)
Asset experience	353	246
Other	(1)	0
Total amount recognized as change in plan assets and benefit obligations	579	(404)
Ending balance	(1,777)	(2,446)	(2,114)
U.S. | Net Actuarial (Loss) Gain | Post-retirement Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	3	4
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	(1)	0
Liability experience	1	(1)
Asset experience	0	0
Other	0	0
Total amount recognized as change in plan assets and benefit obligations	1	(1)
Ending balance	3	3	4
Non-U.S. | Pension  Benefits
Recognized as component of net periodic benefit cost (credit):
Total recognized as component of net periodic benefit cost (credit)	(187)	(162)	(176)
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)	2	0	0
Non-U.S. | Net Actuarial (Loss) Gain | Pension  Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(3,467)	(3,055)
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	116	89
Effect of settlement	5	3
Total recognized as component of net periodic benefit cost (credit)	121	92
Liability experience	617	(1,273)
Asset experience	(199)	916
Effect of curtailment	2	0
Total amount recognized as change in plan assets and benefit obligations	420	(357)
Exchange rate adjustments	22	(147)
Ending balance	(2,904)	(3,467)	(3,055)
Non-U.S. | Net Actuarial (Loss) Gain | Post-retirement Benefits
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(16)	(5)
Recognized as component of net periodic benefit cost (credit):
Amortization of net loss	2	0
Effect of settlement	0	0
Total recognized as component of net periodic benefit cost (credit)	2	0
Liability experience	4	(10)
Asset experience	0	0
Effect of curtailment	0	0
Total amount recognized as change in plan assets and benefit obligations	4	(10)
Exchange rate adjustments	0	(1)
Ending balance	$ (10)	$ (16)	$ (5)