Restructuring Charges (Narrative) (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring, period of recognition	2 years
Asset impairment charges and accelerated depreciation expense | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring, expected cost	$ 90,000,000
Asset impairment charges and accelerated depreciation expense | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring, expected cost	$ 100,000,000