(Information By Geographic Area, Long-Lived Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	$ 12,528	$ 13,395
United States
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	10,221	10,706
EMEA
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	1,280	1,368
Americas, other than U.S.
Segment Reporting Information [Line Items]
Long-Lived Assets	[1]	$ 1,027	$ 1,321

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