Other Operating Expenses, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Operating Expenses, Net [Abstract]
Special charges, net	$ 19	$ 14	$ 38	$ 125
(Gain) loss on sale of assets, net	(5)	4	33	(9)
Other operating (income) expenses, net	$ 14	18	$ 71	116
Merger and restructuring related costs		$ 14		85
Obligation charge arising from a withdrawal liability from a multi-employer pension plan				22
Impairment charge				$ 41