(Information By Geographic Area, Long-Lived Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Long-Lived Assets [1] $ 13,395 $ 13,469
Operating Segments [Member] | United States    
Segment Reporting Information [Line Items]    
Long-Lived Assets [1] 10,706 10,586
Operating Segments [Member] | EMEA    
Segment Reporting Information [Line Items]    
Long-Lived Assets [1] 1,368 1,315
Operating Segments [Member] | Pacific Rim and Asia    
Segment Reporting Information [Line Items]    
Long-Lived Assets [1] 0 201
Operating Segments [Member] | Americas, other than U.S.    
Segment Reporting Information [Line Items]    
Long-Lived Assets [1] $ 1,321 $ 1,367
[1] Long-Lived Assets includes Forestlands and Plants, Properties and Equipment, net.