Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Interest capitalized	$ 83	$ 81	$ 110
Property, plant and equipment included in accounts payable	256	338
Property, plant and equipment additions, non-cash	128	78
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 1,567	$ 1,556	$ 1,548