Income Taxes (Schedule Of The Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 158	$ 231	$ 8
State	28	18	9
Foreign	52	27	20
Total Current	238	276	37
Deferred
Federal	59	(557)	136
State	(2)	25	(33)
Foreign	5	(2)	(2)
Total Deferred	62	(534)	101
Provision for (benefit from) income taxes	$ 300	$ (258)	$ 138