Interest And Other Income (Interest And Other Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Gain (Loss) on Disposition of Assets	$ 56	$ 0	$ 0
Interest income	17	29	32
Deferred Compensation Plan Income	15	(2)	4
Investment in affiliate valuation adjustment	15	0	0
Tax refunds	6	1	13
Seismic Data Sales	5	5	0
Contingent Consideration, Valuation Adjustment	(45)	0	0
Other Income	7	5	4
Interest and other	$ 76	$ 38	$ 53