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Property, Plant and Equipment (Table of Property and Equipment, net) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Property and equipment: |  |
Proved | $ 41,155 | $ 40,378
Unproved and properties under development | 770 | 833
Total oil and gas | 41,925 | 41,211
Less accumulated DD&A | (32,938) | (32,229)
Oil and gas property and equipment, net | 8,987 | 8,982
Other property and equipment | 1,735 | 1,707
Less accumulated DD&A | (685) | (663)
Other property and equipment, net | 1,050 | 1,044
Total property and equipment, net | $ 10,037 | $ 10,026

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