Shareholders' Equity (Deficiency) (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		$ (43)		$ 9	$ (43)	$ 9
Other Comprehensive Loss					11	(66)
Other Comprehensive Income (Loss), Net of Tax	$ 15	(4)	$ 29	(95)
Ending balance	(32)		(57)		(32)	(57)
Foreign Currency Translation Adjustments	15		29		11	(66)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(31)		7	(31)	7
Ending balance	(20)		(59)		(20)	(59)
Foreign Currency Translation Adjustments					11	(66)
Defined Benefit Pension
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		$ (12)		$ 2	(12)	2
Ending balance	$ (12)		$ 2		(12)	2
Foreign Currency Translation Adjustments					$ 0	$ 0