Financial Information By Industry Segment And Geographic Area (Information By Geographic Area, Long-Lived Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	$ 13,713	$ 13,459
Operating Segments [Member] | United States (h)
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	10,545	10,532
Operating Segments [Member] | EMEA
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	1,302	1,009
Operating Segments [Member] | Pacific Rim and Asia
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	236	246
Operating Segments [Member] | Americas, other than U.S.
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	$ 1,630	$ 1,672

[1] Long-Lived Assets includes Forestlands and Plants, Properties and Equipment, net.