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Interest and Other Income (Components Of Interest And Other Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Interest and Other Income [Abstract]    
Document Fiscal Year Focus 2019  
Investment in affiliate fair value adjustment $ 174 $ 0
Interest income 8 7
Deferred compensation plan income 7 4
Other income 2 4
Seismic data sales 0 3
Total interest and other income $ 191 $ 18