Shareholders' Equity (Deficiency) (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 9	$ (1,746)
Other Comprehensive Income	(95)	33
Ending balance	(86)	(1,713)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	7	(1,724)
Other Comprehensive Income	(95)	33
Ending balance	(88)	(1,691)
Defined Benefit Pension
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	2	(14)
Other Comprehensive Income	0	0
Ending balance	2	(14)
Deferred Loss on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0	(8)
Other Comprehensive Income	0	0
Ending balance	$ 0	$ (8)