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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