Debt And Lines Of Credit (Debt Extinguishment) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Debt reductions (a)	[1]	$ 780	$ 993	$ 266
Pre-tax early debt extinguishment costs (b)	[2]	$ 10	$ 83	$ 29

[1] Reductions related to notes with interest rates ranging from 1.57% to 9.38% with original maturities from 2018 to 2032 for the years ended December 31, 2018, 2017 and 2016.

[2] Amounts are included in Restructuring and other charges in the accompanying consolidated statements of operations.