Debt And Lines Of Credit (Debt Extinguishment) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Extinguishment of Debt [Line Items]
Debt reductions		$ 630	$ 2,151	[1]	$ 1,625	[1]	$ 574	[1]
Pre-tax early debt extinguishment costs	[2]		$ 207		$ 276		$ 25

[1] Reductions related to notes with interest rates ranging from 2.00% to 9.38% with original maturities from 2014 to 2031 for the years ended December 31, 2015, 2014 and 2013. Includes the $630 million payment for a portion of the Special Purpose Entity Liability (see Note 12 Variable Interest Entities).

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