Retirement Benefits (Reconciliation of Prior Service Credit) (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 credit:
Effect of curtailment	$ (2)	$ 0	$ 0
Total recognized as component of net periodic benefit cost (credit)	(240)	(222)	(234)
Post-retirement Benefits
Recognized as component of net periodic benefit credit:
Effect of curtailment	0	0	0
Total recognized as component of net periodic benefit cost (credit)	2	1	0
Prior Service Credit (Cost)
Recognized as component of net periodic benefit credit:
Reclassification from AOCI, before tax	(2)	(2)	(2)
Non-U.S. | Pension  Benefits
Recognized as component of net periodic benefit credit:
Effect of curtailment	(2)	0	0
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 credit:
Effect of curtailment	0	0	0
Total recognized as component of net periodic benefit cost (credit)	2	0	0
Non-U.S. | Prior Service Credit (Cost) | Pension  Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(13)	(2)
Recognized as component of net periodic benefit credit:
Reclassification from AOCI, before tax	0	0
Effect of curtailment	2	0
Total recognized as component of net periodic benefit cost (credit)	2	0
Plan amendments	(7)	(11)
Ending balance	(18)	(13)	(2)
Non-U.S. | Prior Service Credit (Cost) | Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	9	11
Recognized as component of net periodic benefit credit:
Reclassification from AOCI, before tax	(2)	(2)
Effect of curtailment	0	0
Total recognized as component of net periodic benefit cost (credit)	(2)	(2)
Plan amendments	0	0
Ending balance	$ 7	$ 9	$ 11